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x in (-oo:+oo)
2*x+y/4 = 18 // - 18
2*x+y/4-18 = 0
2*x+1/4*y-18 = 0 // - 1/4*y-18
2*x = -(1/4*y-18) // : 2
x = (-(1/4*y-18))/2
x = (18-(1/4*y))/2
x = (18-(1/4*y))/2
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