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6-3x+8x = 5x-10-3x-12
-3x+8x-5x+3x = -6+10+12
3x = 16
x =16/3
x = 5,34
2). x+x² = x(2+x)-6
x+x² = 2x+x²-6
x+x²-2x-x² = -6
-x = -6
x = -6/-1
x = 6
Espero te sirva :)