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x in (-oo:+oo)
(2*(x+1))/5 = 4*x-4 // - 4*x-4
(2*(x+1))/5-(4*x)+4 = 0
(2*(x+1))/5-4*x+4 = 0
(2*(x+1))/5+(-4*5*x)/5+(4*5)/5 = 0
2*(x+1)-4*5*x+4*5 = 0
2-18*x+20 = 0
22-18*x = 0
(22-18*x)/5 = 0
(22-18*x)/5 = 0 // * 5
22-18*x = 0
22-18*x = 0 // - 22
-18*x = -22 // : -18
x = -22/(-18)
x = 11/9
x = 11/9
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