Explicación paso a paso:
A= 20x - 15x + 45x - 40x
A = 5x + 5x
A = 10x
B= 10x - 9x - 8x +10x
B= x - 2x
B= x
P= A x B = 10x . x = 10x
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Explicación paso a paso:
A= 20x - 15x + 45x - 40x
A = 5x + 5x
A = 10x
B= 10x - 9x - 8x +10x
B= x - 2x
B= x
P= A x B = 10x . x = 10x