4x - 10 + 5x = 71
9x = 81
x = 9
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4x + 55 = 9x + 10 55 = 5x + 10 45 = 5x x = 9
5x+4x-10 = 35 9x = 35+10 9x = 45 x = 5
x=3 That wasn't hard at all. 5x-10=-7+4x -4x -4x _____________ x-10=-7 +10 +10 _____________ x=3
5x+2=x+10 5x-x=10-2 4x=8 x=2
5x+12 = 4x-88 x = -100