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x in (-oo:+oo)
(5/7)*x+(6/7)*y = -2 // + 2
(5/7)*x+(6/7)*y+2 = 0
5/7*x+6/7*y+2 = 0 // - 6/7*y+2
5/7*x = -(6/7*y+2) // : 5/7
x = (-(6/7*y+2))/5/7
x = -7/5*(6/7*y+2)
x = -7/5*(6/7*y+2)
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