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(8/2)*x-7 = 4/5 // - 4/5
(8/2)*x-(4/5)-7 = 0
(8/2)*x-4/5-7 = 0
4*x-39/5 = 0 // + 39/5
4*x = 39/5 // : 4
x = 39/5/4
x = 39/20
x = 39/20
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