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c in (-oo:+oo)
(7/10)*c-10 = 3/4 // - 3/4
(7/10)*c-(3/4)-10 = 0
(7/10)*c-3/4-10 = 0
7/10*c-43/4 = 0 // + 43/4
7/10*c = 43/4 // : 7/10
c = 43/4/7/10
c = 215/14
c = 215/14
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