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(4/5)*(5*x-30) = 56 // - 56
(4/5)*(5*x-30)-56 = 0
4/5*(5*x-30)-56 = 0
4/5*(5*x-30)-56 = 0
4*x-80 = 0
4*x-80 = 0
4*x-80 = 0 // + 80
4*x = 80 // : 4
x = 80/4
x = 20
x = 20
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