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x in (-oo:+oo)
x/2+20 = x/3+30 // - x/3+30
x/2-(x/3)-30+20 = 0
1/6*x-10 = 0 // + 10
1/6*x = 10 // : 1/6
x = 10/1/6
x = 60
x = 60
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