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(1/5)*(2*x-4) = 7 // - 7
(1/5)*(2*x-4)-7 = 0
1/5*(2*x-4)-7 = 0
1/5*(2*x-4)-7 = 0
2/5*x-39/5 = 0
2/5*x-39/5 = 0
2/5*x-39/5 = 0 // + 39/5
2/5*x = 39/5 // : 2/5
x = 39/5/2/5
x = 39/2
x = 39/2
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