Let's solve the equations one by one.
6) \( (167 + x) - 140 \) при \( x = 131 \)
\[ (167 + 131) - 140 = 298 - 140 = 158 \]
7) \( 318 - (a + 116) \) при \( a = 62 \)
\[ 318 - (62 + 116) = 318 - 178 = 140 \]
8) \( (182 + x) - 67 \) при \( x = 23 \)
\[ (182 + 23) - 67 = 205 - 67 = 138 \]
9) \( 262 - (117 + a) \) при \( a = 53 \)
\[ 262 - (117 + 53) = 262 - 170 = 92 \]
10) \( (313 + x) - 218 \) при \( x = 84 \)
\[ (313 + 84) - 218 = 397 - 218 = 179 \]
11) \( 258 - (184 + a) \) при \( a = 18 \)
\[ 258 - (184 + 18) = 258 - 202 = 56 \]
12) \( (191 + x) - 124 \) при \( x = 56 \)
\[ (191 + 56) - 124 = 247 - 124 = 123 \]
13) \( 344 - (246 + a) \) при \( a = 64 \)
\[ 344 - (246 + 64) = 344 - 310 = 34 \]
14) \( (284 + x) - 232 \) при \( x = 118 \)
\[ (284 + 118) - 232 = 402 - 232 = 170 \]
15) \( 248 - (138 + a) \) при \( a = 86 \)
\[ 248 - (138 + 86) = 248 - 224 = 24 \]
16) \( (216 + x) - 198 \) при \( x = 203 \)
\[ (216 + 203) - 198 = 419 - 198 = 221 \]
17) \( 384 - (262 + a) \) при \( a = 51 \)
\[ 384 - (262 + 51) = 384 - 313 = 71 \]
18) \( (361 + x) - 212 \) при \( x = 185 \)
\[ (361 + 185) - 212 = 546 - 212 = 334 \]
19) \( 321 - (186 + a) \) при \( a = 116 \)
\[ 321 - (186 + 116) = 321 - 302 = 19 \]
20) \( (312 + x) - 165 \) при \( x = 161 \)
\[ (312 + 161) - 165 = 473 - 165 = 308 \]
Here are the results for each calculation: 6) 158 7) 140 8) 138 9) 92 10) 179 11) 56 12) 123 13) 34 14) 170 15) 24 16) 221 17) 71 18) 334 19) 19 20) 308