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x in (-oo:+oo)
(9/2)*x = (7/2)*x+2 // - (7/2)*x+2
(9/2)*x-((7/2)*x)-2 = 0
(9/2)*x+(-7/2)*x-2 = 0
x-2 = 0 // + 2
x = 2
x = 2
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