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(x+1)/4+5*x-(x/5) = 4*x // - 4*x
(x+1)/4+5*x-(x/5)-(4*x) = 0
(x+1)/4+5*x-(x/5)-4*x = 0
(x+1)/4+5*x-x/5-4*x = 0
(5*(x+1))/(4*5)+(4*5*5*x)/(4*5)+(4*(-x))/(4*5)+(-4*4*5*x)/(4*5) = 0
5*(x+1)+4*5*5*x+4*(-x)-4*4*5*x = 0
105*x-4*x-80*x+5 = 0
101*x-80*x+5 = 0
21*x+5 = 0
(21*x+5)/(4*5) = 0
(21*x+5)/(4*5) = 0 // * 4*5
21*x+5 = 0
21*x+5 = 0 // - 5
21*x = -5 // : 21
x = -5/21
x = -5/21
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