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5*x+7*x+48 = 12*(x/4) // - 12*(x/4)
5*x+7*x-(12*(x/4))+48 = 0
5*x+7*x-3*x+48 = 0
9*x+48 = 0 // - 48
9*x = -48 // : 9
x = -48/9
x = -16/3
x = -16/3
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