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(3/4)*(5*x+7) = 3*(4-(4*x))+9 // - 3*(4-(4*x))+9
(3/4)*(5*x+7)-(3*(4-(4*x)))-9 = 0
(3/4)*(5*x+7)-3*(4-4*x)-9 = 0
3/4*(5*x+7)-3*(4-4*x)-9 = 0
3/4*(5*x+7)-3*(4-4*x)-9 = 0
63/4*x-9-27/4 = 0
63/4*x-63/4 = 0
63/4*x-63/4 = 0
63/4*x-63/4 = 0 // + 63/4
63/4*x = 63/4 // : 63/4
x = 63/4/63/4
x = 1
x = 1
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