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4*((1/3)*x-9) = (1/2)*(x-7) // - (1/2)*(x-7)
4*((1/3)*x-9)-((1/2)*(x-7)) = 0
4*((1/3)*x-9)+(-1/2)*(x-7) = 0
4*(1/3*x-9)-1/2*(x-7) = 0
4*(1/3*x-9)-1/2*(x-7) = 0
5/6*x-65/2 = 0
5/6*x-65/2 = 0
5/6*x-65/2 = 0 // + 65/2
5/6*x = 65/2 // : 5/6
x = 65/2/5/6
x = 39
x = 39
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