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(1/5)*(5*x-5) = 3 // - 3
(1/5)*(5*x-5)-3 = 0
1/5*(5*x-5)-3 = 0
1/5*(5*x-5)-3 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x = 4
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