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c in (-oo:+oo)
(7/10)*c+(1/5)*c = 2/3 // - 2/3
(7/10)*c+(1/5)*c-(2/3) = 0
(7/10)*c+(1/5)*c-2/3 = 0
9/10*c-2/3 = 0 // + 2/3
9/10*c = 2/3 // : 9/10
c = 2/3/9/10
c = 20/27
c = 20/27
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