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c in (-oo:+oo)
(4/5)*c-((1/10)*c) = (9/10)*c // - (9/10)*c
(4/5)*c-((1/10)*c)-((9/10)*c) = 0
(4/5)*c+(-1/10)*c+(-9/10)*c = 0
-1/5*c = 0 // : -1/5
c = 0
c = 0
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