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(1/5)*(10*x-7) = 4 // - 4
(1/5)*(10*x-7)-4 = 0
1/5*(10*x-7)-4 = 0
1/5*(10*x-7)-4 = 0
2*x-27/5 = 0
2*x-27/5 = 0
2*x-27/5 = 0 // + 27/5
2*x = 27/5 // : 2
x = 27/5/2
x = 27/10
x = 27/10
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