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x in (-oo:+oo)
x = (3*y-7)/4 // - (3*y-7)/4
x-((3*y-7)/4) = 0
(-1*(3*y-7))/4+x = 0
(-1*(3*y-7))/4+(4*x)/4 = 0
4*x-1*(3*y-7) = 0
4*x-3*y+7 = 0
(4*x-3*y+7)/4 = 0
(4*x-3*y+7)/4 = 0 // * 4
4*x-3*y+7 = 0
4*x-3*y+7 = 0 // - 7-3*y
4*x = -(7-3*y) // : 4
x = (-(7-3*y))/4
x = (-(7-3*y))/4
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