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c in (-oo:+oo)
(1/3)*(10*c-3) = 7 // - 7
(1/3)*(10*c-3)-7 = 0
1/3*(10*c-3)-7 = 0
1/3*(10*c-3)-7 = 0
10/3*c-8 = 0
10/3*c-8 = 0
10/3*c-8 = 0 // + 8
10/3*c = 8 // : 10/3
c = 8/10/3
c = 12/5
c = 12/5
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