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