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