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x in (-oo:+oo)
(1/2)*(5*x+1) = 8*x // - 8*x
(1/2)*(5*x+1)-(8*x) = 0
(1/2)*(5*x+1)-8*x = 0
1/2*(5*x+1)-8*x = 0
1/2*(5*x+1)-8*x = 0
1/2-11/2*x = 0
1/2-11/2*x = 0
1/2-11/2*x = 0 // - 1/2
-11/2*x = -1/2 // : -11/2
x = -1/2/(-11/2)
x = 1/11
x = 1/11
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