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3*x+x+21/4+25/6 = 4 // - 4
3*x+x+21/4+25/6-4 = 0
4*x+65/12 = 0 // - 65/12
4*x = -65/12 // : 4
x = -65/12/4
x = -65/48
x = -65/48
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