Q should be added to P to get p+q
7a should be subtracted from 12a to get 5a
2y should be subtracted from 3x to get 3x-2y
Explanation:
b.solution
we should add q to get p+q
c.solution
we should subtract 7a to get 5a
d.solution
we should subtract 2y to get 3x-2y
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