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c in (-oo:+oo)
(1/3)*(6*c+21) = 63 // - 63
(1/3)*(6*c+21)-63 = 0
1/3*(6*c+21)-63 = 0
1/3*(6*c+21)-63 = 0
2*c-56 = 0
2*c-56 = 0
2*c-56 = 0 // + 56
2*c = 56 // : 2
c = 56/2
c = 28
c = 28
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