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20-(2*(1/24)*x) = 10-((1/24)*x) // - 10-((1/24)*x)
(1/24)*x-(2*(1/24)*x)-10+20 = 0
(-1/12)*x+(1/24)*x-10+20 = 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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