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x in (-oo:+oo)
20-((1/4)*x) = 30 // - 30
20-((1/4)*x)-30 = 0
(-1/4)*x-30+20 = 0
-1/4*x-10 = 0 // + 10
-1/4*x = 10 // : -1/4
x = 10/(-1/4)
x = -40
x = -40
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