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4 = (2/12)*x // - (2/12)*x
4-((2/12)*x) = 0
(-1/6)*x+4 = 0
4-1/6*x = 0 // - 4
-1/6*x = -4 // : -1/6
x = -4/(-1/6)
x = 24
x = 24
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