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c in (-oo:+oo)
(-4/5)*c = 7/10 // - 7/10
(-4/5)*c-(7/10) = 0
(-4/5)*c-7/10 = 0
-4/5*c-7/10 = 0 // + 7/10
-4/5*c = 7/10 // : -4/5
c = 7/10/(-4/5)
c = -7/8
c = -7/8
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