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x in (-oo:+oo)
(-1/2)*x-(5*y) = 6 // - 6
(-1/2)*x-(5*y)-6 = 0
(-1/2)*x-5*y-6 = 0
-1/2*x-5*y-6 = 0 // + -5*y-6
-1/2*x = -(-5*y-6) // : -1/2
x = (-(-5*y-6))/(-1/2)
x = -2*(6-(-5*y))
x = -2*(6-(-5*y))
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