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x in (-oo:+oo)
x+(1/2)*x+(2/3)*x = 180 // - 180
x+(1/2)*x+(2/3)*x-180 = 0
13/6*x-180 = 0 // + 180
13/6*x = 180 // : 13/6
x = 180/13/6
x = 1080/13
x = 1080/13
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