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x in (-oo:+oo)
(1/6)*x+(1/2)*x+x = 150 // - 150
(1/6)*x+(1/2)*x+x-150 = 0
5/3*x-150 = 0 // + 150
5/3*x = 150 // : 5/3
x = 150/5/3
x = 90
x = 90
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