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x in (-oo:+oo)
(4/7)*y = (1/2)*x-1 // - (1/2)*x-1
(4/7)*y-((1/2)*x)+1 = 0
(-1/2)*x+(4/7)*y+1 = 0
4/7*y-1/2*x+1 = 0 // - 4/7*y+1
-1/2*x = -(4/7*y+1) // : -1/2
x = (-(4/7*y+1))/(-1/2)
x = 2*(4/7*y+1)
x = 2*(4/7*y+1)
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