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(1/5)*(10*x-8) = 4 // - 4
(1/5)*(10*x-8)-4 = 0
1/5*(10*x-8)-4 = 0
1/5*(10*x-8)-4 = 0
2*x-28/5 = 0
2*x-28/5 = 0
2*x-28/5 = 0 // + 28/5
2*x = 28/5 // : 2
x = 28/5/2
x = 14/5
x = 14/5
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