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(4/5)*(5*x-20) = 32 // - 32
(4/5)*(5*x-20)-32 = 0
4/5*(5*x-20)-32 = 0
4/5*(5*x-20)-32 = 0
4*x-48 = 0
4*x-48 = 0
4*x-48 = 0 // + 48
4*x = 48 // : 4
x = 48/4
x = 12
x = 12
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