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x in (-oo:+oo)
(3*x)/2-5 = 20 // - 20
(3*x)/2-20-5 = 0
3/2*x-25 = 0 // + 25
3/2*x = 25 // : 3/2
x = 25/3/2
x = 50/3
x = 50/3
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