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x in (-oo:+oo)
(-1/2)*y = 11-(3*x) // - 11-(3*x)
3*x+(-1/2)*y-11 = 0
3*x-1/2*y-11 = 0 // + -1/2*y-11
3*x = -(-1/2*y-11) // : 3
x = (-(-1/2*y-11))/3
x = (11-(-1/2*y))/3
x = (11-(-1/2*y))/3
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