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