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x in (-oo:+oo)
(1/2)*x-(6*y) = 7 // - 7
(1/2)*x-(6*y)-7 = 0
(1/2)*x-6*y-7 = 0
1/2*x-6*y-7 = 0 // + -6*y-7
1/2*x = -(-6*y-7) // : 1/2
x = (-(-6*y-7))/1/2
x = 2*(7-(-6*y))
x = 2*(7-(-6*y))
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