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x in (-oo:+oo)
(1/2)*(5*x+2) = 4*x // - 4*x
(1/2)*(5*x+2)-(4*x) = 0
(1/2)*(5*x+2)-4*x = 0
1/2*(5*x+2)-4*x = 0
1/2*(5*x+2)-4*x = 0
1-3/2*x = 0
1-3/2*x = 0
1-3/2*x = 0 // - 1
-3/2*x = -1 // : -3/2
x = -1/(-3/2)
x = 2/3
x = 2/3
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