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