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