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x in (-oo:+oo)
-3*y = (1/2)*x-5 // - (1/2)*x-5
5-((1/2)*x)-3*y = 0
(-1/2)*x-3*y+5 = 0
5-1/2*x-3*y = 0 // - 5-3*y
-1/2*x = -(5-3*y) // : -1/2
x = (-(5-3*y))/(-1/2)
x = 2*(5-3*y)
x = 2*(5-3*y)
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