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x + 5
x + 4
+4x+20
+5x
+9x+20
b) - 10x + 3 = (x - 3) (3x - 1) VERDADERO
x- 3
3x - 1
-x + 3
- 9x
-10x +3
c) - = (3x + 4y)(3x -4y) VERDADERA
3X +4Y
3X - 4Y
-12xy+16
+12xy
se simplifican valores con signos contrarios y queda:
-