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(4-9)*((5*x)/4) = 3*x+7 // - 3*x+7
(4-9)*((5*x)/4)-(3*x)-7 = 0
(4-9)*((5*x)/4)-3*x-7 = 0
-37/4*x-7 = 0 // + 7
-37/4*x = 7 // : -37/4
x = 7/(-37/4)
x = -28/37
x = -28/37
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