subtract by horizontal method.
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d) x+y -(-x-y)
= x+y+x+y
= 2x+2y
e) 10-4pqr +3p - (7pqr -8p +3)
= 10 -4pqr +3p -7pqr +8p -3
= 7 +11p -11pqr
f) 5x^3 -3x^2 + 2x -3 -(5x^3 +3x^2-x-3)
= 5x^3 -3x^2 + 2x -3 - 5x^3 -3x^2+x+3
= -6x^2+3x
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