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y baca buku
b. (-x"'+5y)+(9x-15y+10) = -x"'+9x+5y-15y+10 = -x"'+9x-15y+10
c. (9x+15y-9)+(9x-15y+10) = 9x+9x+15y-15y-9+10 = 18x+1
d. (5p-2pq+6q)+(-4p+3pq-5) = 5p-4p-2pq+3pq+6-5 = p+pq+1
maaf klo salah...