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x in (-oo:+oo)
(1/2)*y-(3*x) = 7 // - 7
(1/2)*y-(3*x)-7 = 0
(1/2)*y-3*x-7 = 0
1/2*y-3*x-7 = 0 // - 1/2*y-7
-3*x = -(1/2*y-7) // : -3
x = (-(1/2*y-7))/(-3)
x = (7-(1/2*y))/(-3)
x = (7-(1/2*y))/(-3)
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