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x in (-oo:+oo)
(-3/4)*x-((1/2)*y) = 3 // - 3
(-3/4)*x-((1/2)*y)-3 = 0
(-3/4)*x+(-1/2)*y-3 = 0
-3/4*x-1/2*y-3 = 0 // + -1/2*y-3
-3/4*x = -(-1/2*y-3) // : -3/4
x = (-(-1/2*y-3))/(-3/4)
x = -4/3*(3-(-1/2*y))
x = -4/3*(3-(-1/2*y))
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