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2*(4*x-6) = (1/5)*(25*x+30) // - (1/5)*(25*x+30)
2*(4*x-6)-((1/5)*(25*x+30)) = 0
2*(4*x-6)+(-1/5)*(25*x+30) = 0
2*(4*x-6)-1/5*(25*x+30) = 0
2*(4*x-6)-1/5*(25*x+30) = 0
3*x-18 = 0
3*x-18 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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