2(7+9х)=6х+2

Solution:

• 2(7 + 9x) = 6x + 2
• Expand: 14 + 18x = 6x + 2
• Move x-terms: 18x - 6x = 2 - 14 → 12x = -12
• x = -1

Check: 2(7 + 9(-1)) = 2( -2) = -4; 6(-1) + 2 = -4. OK.

Answer: x = -1.