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21-(3*(1/20)*x) = 14-(2*(1/20)*x) // - 14-(2*(1/20)*x)
2*(1/20)*x-(3*(1/20)*x)-14+21 = 0
(-3/20)*x+2*(1/20)*x-14+21 = 0
7-1/20*x = 0 // - 7
-1/20*x = -7 // : -1/20
x = -7/(-1/20)
x = 140
x = 140
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