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Find the answer to the math problem in Grade Two.
Solution:

a(x^2+x-c)+b(2x^2-x-2)

=ax? +ax-ac+2bx? -bx-2b

=(a+2b)x? +(a-b)x-ac-2b=7x? +4x+3

therefore

a+2b=7

a-b=4

-ac-2b=3

Simultaneous solution: a=5, b= 1, c=- 1.

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