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c in (-oo:+oo)
(1/6)*(c-20) = 30 // - 30
(1/6)*(c-20)-30 = 0
1/6*(c-20)-30 = 0
1/6*(c-20)-30 = 0
1/6*c-100/3 = 0
1/6*c-100/3 = 0
1/6*c-100/3 = 0 // + 100/3
1/6*c = 100/3 // : 1/6
c = 100/3/1/6
c = 200
c = 200
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