3а-(10+5а)=54

Solve for a (the Cyrillic a is the same as a):

3a − (10 + 5a) = 54 => 3a − 10 − 5a = 54 => −2a − 10 = 54 => −2a = 64 => a = −32

Check: 3(−32) − (10 + 5(−32)) = −96 − (10 − 160) = −96 − (−150) = 54, correct.

Answer: a = −32.