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x in (-oo:+oo)
(1/5)*x-(2*x)-((3/7)*y)+(5/7)*y = 0
(1/5)*x-2*x+(-3/7)*y+(5/7)*y = 0
2/7*y-9/5*x = 0 // - 2/7*y
-9/5*x = -(2/7*y) // : -9/5
x = (-(2/7*y))/(-9/5)
x = 10/63*y
x = 10/63*y
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