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x in (-oo:+oo)
-((1/2)*y) = 10-(5*x) // - 10-(5*x)
5*x-((1/2)*y)-10 = 0
5*x+(-1/2)*y-10 = 0
5*x-1/2*y-10 = 0 // + -1/2*y-10
5*x = -(-1/2*y-10) // : 5
x = (-(-1/2*y-10))/5
x = (10-(-1/2*y))/5
x = (10-(-1/2*y))/5
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