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(3*x)/8-((5*x)/4) = 13 // - 13
(3*x)/8-((5*x)/4)-13 = 0
(3*x)/8+(-5/4)*x-13 = 0
-7/8*x-13 = 0 // + 13
-7/8*x = 13 // : -7/8
x = 13/(-7/8)
x = -104/7
x = -104/7
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