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2*x+7/4 = 3*x-(21/4) // - 3*x-(21/4)
2*x-(3*x)+7/4+21/4 = 0
2*x-3*x+7/4+21/4 = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x = 7
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