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(1/7)*(7*x-4) = 1/5-(7/5) // - 1/5-(7/5)
(1/7)*(7*x-4)-(1/5)+7/5 = 0
(1/7)*(7*x-4)-1/5+7/5 = 0
1/7*(7*x-4)-1/5+7/5 = 0
(1/7*5*(7*x-4))/5-1/5+7/5 = 0
1/7*5*(7*x-4)-1+7 = 0
5*x-27/7+7 = 0
5*x+22/7 = 0
(5*x+22/7)/5 = 0
(5*x+22/7)/5 = 0 // * 5
5*x+22/7 = 0
5*x+22/7 = 0 // - 22/7
5*x = -22/7 // : 5
x = -22/7/5
x = -22/35
x = -22/35
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