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5*(x+2) = (3/5)*(10*n+5) // - (3/5)*(10*n+5)
5*(x+2)-((3/5)*(10*n+5)) = 0
5*(x+2)+(-3/5)*(10*n+5) = 0
5*(x+2)-3/5*(10*n+5) = 0
5*(x+2)-3/5*(10*n+5) = 0
5*x-6*n+7 = 0
5*x-6*n+7 = 0
5*x-6*n+7 = 0 // - 7-6*n
5*x = -(7-6*n) // : 5
x = (-(7-6*n))/5
x = (-(7-6*n))/5
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