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= 5x +2x +3y -3y
= 7x
b. 4a +b -3c -d +2a +3b -2c +3d
= 4a +2a +b +3b -3c -2c -d +3d
= 6a +4b -5c +2d
c. 3a +5b +3c +6d +6a -7b -7c -2d
= 3a +6a +5b -7b +3c -7c +6d -2d
= 9a -2b -4c +4d
d. 5p +2r -3s +6t +7p -2r -3s -6t
= 5p +7p +2r -2r -3s -3s +6t -6t
= 12p -6s
Itu jawabannya.