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2*x-21 = (5/6)*x // - (5/6)*x
2*x-((5/6)*x)-21 = 0
2*x+(-5/6)*x-21 = 0
7/6*x-21 = 0 // + 21
7/6*x = 21 // : 7/6
x = 21/7/6
x = 18
x = 18
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