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c in (-oo:+oo)
40-(4*(1/22)*c) = 30-(3*(1/22)*c) // - 30-(3*(1/22)*c)
3*(1/22)*c-(4*(1/22)*c)-30+40 = 0
(-2/11)*c+3*(1/22)*c-30+40 = 0
10-1/22*c = 0 // - 10
-1/22*c = -10 // : -1/22
c = -10/(-1/22)
c = 220
c = 220
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