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x in (-oo:+oo)
(1/6)*(2*x+80) = 3*x // - 3*x
(1/6)*(2*x+80)-(3*x) = 0
(1/6)*(2*x+80)-3*x = 0
1/6*(2*x+80)-3*x = 0
1/6*(2*x+80)-3*x = 0
40/3-8/3*x = 0
40/3-8/3*x = 0
40/3-8/3*x = 0 // - 40/3
-8/3*x = -40/3 // : -8/3
x = -40/3/(-8/3)
x = 5
x = 5
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