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(1/5)*(10*x-8) = 7 // - 7
(1/5)*(10*x-8)-7 = 0
1/5*(10*x-8)-7 = 0
1/5*(10*x-8)-7 = 0
2*x-43/5 = 0
2*x-43/5 = 0
2*x-43/5 = 0 // + 43/5
2*x = 43/5 // : 2
x = 43/5/2
x = 43/10
x = 43/10
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