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(1/5)*(2*x-1) = 7 // - 7
(1/5)*(2*x-1)-7 = 0
1/5*(2*x-1)-7 = 0
1/5*(2*x-1)-7 = 0
2/5*x-36/5 = 0
2/5*x-36/5 = 0
2/5*x-36/5 = 0 // + 36/5
2/5*x = 36/5 // : 2/5
x = 36/5/2/5
x = 18
x = 18
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