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x in (-oo:+oo)
18-((2/5)*x) = 40 // - 40
18-((2/5)*x)-40 = 0
(-2/5)*x-40+18 = 0
-2/5*x-22 = 0 // + 22
-2/5*x = 22 // : -2/5
x = 22/(-2/5)
x = -55
x = -55
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