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27-(3*(1/20)*x) = 18-(2*(1/20)*x) // - 18-(2*(1/20)*x)
2*(1/20)*x-(3*(1/20)*x)-18+27 = 0
(-3/20)*x+2*(1/20)*x-18+27 = 0
9-1/20*x = 0 // - 9
-1/20*x = -9 // : -1/20
x = -9/(-1/20)
x = 180
x = 180
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