Subtract the sum of x+2y and x+7y from 3x-7y
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Answer:
Step-by-step explanation:
X+2Y+X+7Y = 2X+9Y
3X - 7Y- 2X +9Y = X+2Y
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sum of x+2y+x+7y=2x+9y
3x-7y-2x-9y
=x-16y
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