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5*(2*x+4) = 90 // - 90
5*(2*x+4)-90 = 0
5*(2*x+4)-90 = 0
10*x-70 = 0
10*x-70 = 0
10*x-70 = 0 // + 70
10*x = 70 // : 10
x = 70/10
x = 7
x = 7
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