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x in (-oo:+oo)
18-((1/4)*x) = 1/2 // - 1/2
18-((1/4)*x)-(1/2) = 0
(-1/4)*x-1/2+18 = 0
35/2-1/4*x = 0 // - 35/2
-1/4*x = -35/2 // : -1/4
x = -35/2/(-1/4)
x = 70
x = 70
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