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x in (-oo:+oo)
(1/5)*(5*x+6) = 4*x // - 4*x
(1/5)*(5*x+6)-(4*x) = 0
(1/5)*(5*x+6)-4*x = 0
1/5*(5*x+6)-4*x = 0
1/5*(5*x+6)-4*x = 0
6/5-3*x = 0
6/5-3*x = 0
6/5-3*x = 0 // - 6/5
-3*x = -6/5 // : -3
x = -6/5/(-3)
x = 2/5
x = 2/5
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