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x in (-oo:+oo)
(1/2)*x+(3/4)*x-2 = 23 // - 23
(1/2)*x+(3/4)*x-23-2 = 0
5/4*x-25 = 0 // + 25
5/4*x = 25 // : 5/4
x = 25/5/4
x = 20
x = 20
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