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x in (-oo:+oo)
18-((2/5)*x) = -22 // + 22
18-((2/5)*x)+22 = 0
(-2/5)*x+18+22 = 0
40-2/5*x = 0 // - 40
-2/5*x = -40 // : -2/5
x = -40/(-2/5)
x = 100
x = 100
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