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2014-05-01T16:10:53-03:00
MMC: (4-x²)
Logo:
 \frac{6}{2+x}+  \frac{2+x}{2-x} = \frac{ x^{2}}{4- x^{2} }  ⇒ \frac{6(2-x)+(2+x)(2+x)}{4- x^{2} } = \frac{ x^{2}}{4- x^{2}}

6(2-x) + (2+x)(2-x) = x²
12-6x+4+2x+2x+x² = x²
16-2x+x²-x²*0
16-2x=0
-2x=-16 (-1)
2x=16
x=  \frac{16}{2}
x=8
2 5 2