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4.2-((1/20)*x) = (1/4)*x // - (1/4)*x
4.2-((1/20)*x)-((1/4)*x) = 0
(-1/20)*x+(-1/4)*x+4.2 = 0
4.2-3/10*x = 0 // - 4.2
-3/10*x = -4.2 // : -3/10
x = -4.2/(-3/10)
x = 14
x = 14
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