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x in (-oo:+oo)
7*y = ((3*7)/7)*x-(7*12) // - ((3*7)/7)*x-(7*12)
7*y-(((3*7)/7)*x)+7*12 = 0
7*y-3*x+7*12 = 0
7*y-3*x+84 = 0 // - 7*y+84
-3*x = -(7*y+84) // : -3
x = (-(7*y+84))/(-3)
x = (7*y+84)/3
x = (7*y+84)/3
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