3 (2x + 5) - x + 6 = 2 (4x + 7) - 5
On the left side of the equal sign, multiply everything in the parenthesis by 3.
On the right side of the equal sign, multiply everything in the parenthesis by 2.
6x + 15 - x + 6 = 8x + 14 - 5
Combine like terms.
5x + 21 = 8x + 9
Subtract 5x from both sides.
21 = 3x + 9
Subtract 9 from both sides.
12 = 3x
Divide 3 on both sides.
x = 4
Hope this helps!