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