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(1/5)*(2*x-5) = 3 // - 3
(1/5)*(2*x-5)-3 = 0
1/5*(2*x-5)-3 = 0
1/5*(2*x-5)-3 = 0
2/5*x-4 = 0
2/5*x-4 = 0
2/5*x-4 = 0 // + 4
2/5*x = 4 // : 2/5
x = 4/2/5
x = 10
x = 10
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