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30-(3*(1/24)*x) = 20-(2*(1/24)*x) // - 20-(2*(1/24)*x)
2*(1/24)*x-(3*(1/24)*x)-20+30 = 0
(-1/8)*x+2*(1/24)*x-20+30 = 0
10-1/24*x = 0 // - 10
-1/24*x = -10 // : -1/24
x = -10/(-1/24)
x = 240
x = 240
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