Answer:
x = 2
Explanation:
Simplifying expressions:
 5x - 7 - 5(7x - 12) + 7 = 0
Distribute (-5) to each term of (7x - 12) 
 5x - 7 + 7x*(-5) + (-12)*(-5) + 7 = 0
 5x - 7 - 35x + 60 + 7 = 0
 5x - 35x - 7 + 60 +7 = 0
Combine like terms.
 -30x + 60 = 0
Subtract 60 from both sides
 -30x = -60
Divide both sides by (-30)
 x = (-60)/(-30)
 x = 2