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c in (-oo:+oo)
(4/5)*c-((1/10)*c) = 9/10 // - 9/10
(4/5)*c-((1/10)*c)-(9/10) = 0
(4/5)*c+(-1/10)*c-9/10 = 0
7/10*c-9/10 = 0 // + 9/10
7/10*c = 9/10 // : 7/10
c = 9/10/7/10
c = 9/7
c = 9/7
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