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3(2x+3)²;=39 (2x+3)²;=13 2x+3=±√13 2x=-3±√13 x=(-3-√13)/2,x=(-3+√13)/2
(10x-90+2x)/2=75 10x-90+2x=75*2 12x-90=150 12x=240 x=20
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