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x in (-oo:+oo)
(1/5)*x-((9/10)*x) = 20-55 // - 20-55
(1/5)*x-((9/10)*x)-20+55 = 0
(1/5)*x+(-9/10)*x-20+55 = 0
35-7/10*x = 0 // - 35
-7/10*x = -35 // : -7/10
x = -35/(-7/10)
x = 50
x = 50
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