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(2/5)*(7*x-1) = 8 // - 8
(2/5)*(7*x-1)-8 = 0
2/5*(7*x-1)-8 = 0
2/5*(7*x-1)-8 = 0
14/5*x-42/5 = 0
14/5*x-42/5 = 0
14/5*x-42/5 = 0 // + 42/5
14/5*x = 42/5 // : 14/5
x = 42/5/14/5
x = 3
x = 3
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