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2014-05-15T16:05:27+03:00
(2x-3)²=121 => 2x-3=+/-11 =>2x=+/-11+3=>x= \frac{+/-11+3}{2}
=> x apartine multimii {- \frac{11+3}{2}=7  \frac{11-3}{2}=4
x∈{7,4}
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