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c in (-oo:+oo)
(1/10)*(c+3) = 9/10 // - 9/10
(1/10)*(c+3)-(9/10) = 0
(1/10)*(c+3)-9/10 = 0
1/10*(c+3)-9/10 = 0
(1/10*10*(c+3))/10-9/10 = 0
1/10*10*(c+3)-9 = 0
c-6 = 0
(c-6)/10 = 0
(c-6)/10 = 0 // * 10
c-6 = 0
c-6 = 0 // + 6
c = 6
c = 6
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