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(2/3)*x-((5/2)*x) = (3/4)*x-13 // - (3/4)*x-13
(2/3)*x-((5/2)*x)-((3/4)*x)+13 = 0
(2/3)*x+(-5/2)*x+(-3/4)*x+13 = 0
13-31/12*x = 0 // - 13
-31/12*x = -13 // : -31/12
x = -13/(-31/12)
x = 156/31
x = 156/31
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