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(4/5)*x-((2/5)*x) = x-(3/7) // - x-(3/7)
(4/5)*x-((2/5)*x)-x+3/7 = 0
(4/5)*x+(-2/5)*x-x+3/7 = 0
3/7-3/5*x = 0 // - 3/7
-3/5*x = -3/7 // : -3/5
x = -3/7/(-3/5)
x = 5/7
x = 5/7
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