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(4/7)*x+1/5 = 5*x+169/70 // - 5*x+169/70
(4/7)*x-(5*x)+1/5-(169/70) = 0
(4/7)*x-5*x+1/5-169/70 = 0
-31/7*x-31/14 = 0 // + 31/14
-31/7*x = 31/14 // : -31/7
x = 31/14/(-31/7)
x = -1/2
x = -1/2
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