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18-(3*(1/24)*x) = 12-(2*(1/24)*x) // - 12-(2*(1/24)*x)
2*(1/24)*x-(3*(1/24)*x)-12+18 = 0
(-1/8)*x+2*(1/24)*x-12+18 = 0
6-1/24*x = 0 // - 6
-1/24*x = -6 // : -1/24
x = -6/(-1/24)
x = 144
x = 144
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