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18-(3*(1/30)*x) = 12-(2*(1/30)*x) // - 12-(2*(1/30)*x)
2*(1/30)*x-(3*(1/30)*x)-12+18 = 0
(-1/10)*x+2*(1/30)*x-12+18 = 0
6-1/30*x = 0 // - 6
-1/30*x = -6 // : -1/30
x = -6/(-1/30)
x = 180
x = 180
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