7(-3x -2) + 4(1 - x) = 9(2x - 5) - 3(3x - 5)
distribute on both sides:
-21x - 14 + 4 - 4x = 18x - 45 - 9x + 15
combine like terms on both sides:
-25x -10 = 9x - 30
add 25x to both sides:
-10 = 34x - 30
add 30 to both sides:
20 = 34x
divide both sides by 34:
x = 20/34 = 10/17