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(2/5)*(x+1) = g // - g
(2/5)*(x+1)-g = 0
2/5*(x+1)-g = 0
2/5*(x+1)-g = 0
2/5*x-g+2/5 = 0
2/5*x-g+2/5 = 0
2/5*x-g+2/5 = 0 // - 2/5-g
2/5*x = -(2/5-g) // : 2/5
x = (-(2/5-g))/2/5
x = 5/2*(g-2/5)
x = 5/2*(g-2/5)
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