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x in (-oo:+oo)
(2*x)/3 = x/2+15 // - x/2+15
(2*x)/3-(x/2)-15 = 0
1/6*x-15 = 0 // + 15
1/6*x = 15 // : 1/6
x = 15/1/6
x = 90
x = 90
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