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(1/5)*(2*x-5) = 5 // - 5
(1/5)*(2*x-5)-5 = 0
1/5*(2*x-5)-5 = 0
1/5*(2*x-5)-5 = 0
2/5*x-6 = 0
2/5*x-6 = 0
2/5*x-6 = 0 // + 6
2/5*x = 6 // : 2/5
x = 6/2/5
x = 15
x = 15
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