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x in (-oo:+oo)
(1/2)*x+24 = 3*x-45 // - 3*x-45
(1/2)*x-(3*x)+24+45 = 0
(1/2)*x-3*x+24+45 = 0
69-5/2*x = 0 // - 69
-5/2*x = -69 // : -5/2
x = -69/(-5/2)
x = 138/5
x = 138/5
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