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(1/3)*x+70 = (3/4)*x+30 // - (3/4)*x+30
(1/3)*x-((3/4)*x)-30+70 = 0
(1/3)*x+(-3/4)*x-30+70 = 0
40-5/12*x = 0 // - 40
-5/12*x = -40 // : -5/12
x = -40/(-5/12)
x = 96
x = 96
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