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x in (-oo:+oo)
(1/2)*x+(3/4)*y = 9/4 // - 9/4
(1/2)*x+(3/4)*y-(9/4) = 0
(1/2)*x+(3/4)*y-9/4 = 0
1/2*x+3/4*y-9/4 = 0 // - 3/4*y-9/4
1/2*x = -(3/4*y-9/4) // : 1/2
x = (-(3/4*y-9/4))/1/2
x = 2*(9/4-(3/4*y))
x = 2*(9/4-(3/4*y))
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