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x in (-oo:+oo)
(1/2)*x-((3/4)*y) = 7/2 // - 7/2
(1/2)*x-((3/4)*y)-(7/2) = 0
(1/2)*x+(-3/4)*y-7/2 = 0
1/2*x-3/4*y-7/2 = 0 // + -3/4*y-7/2
1/2*x = -(-3/4*y-7/2) // : 1/2
x = (-(-3/4*y-7/2))/1/2
x = 2*(7/2-(-3/4*y))
x = 2*(7/2-(-3/4*y))
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