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6*(x-2) = (1/5)*(10*x-20) // - (1/5)*(10*x-20)
6*(x-2)-((1/5)*(10*x-20)) = 0
6*(x-2)+(-1/5)*(10*x-20) = 0
6*(x-2)-1/5*(10*x-20) = 0
6*(x-2)-1/5*(10*x-20) = 0
4*x-8 = 0
4*x-8 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x = 2
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