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b. 5x²-x+25x-5=5x²+24x-5
c.14x-49-4x²+14x=28x-49-4x²
b. 5x-x+25x-5=25x+5x-x-5
=29x-5
c. 14x+49-4x+14x=14x+14x-4x+49
=14x+49
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