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12a-5a -3b+b +7-9= 7a - 2b +2
b. -3m+4n-6-7n-8m+10
-3m-8m +4n-7n -6+10 = 11m -3n +4
c. 2x²+4xy-3xy-6y²
= 2x² + xy - 6y²
d. (3p - 2r)(3p - 2r) = 3p²-6pr-6pr+2r²
= 3p² -12pr +2r²
9 a. (i) (x+3)(x-10)
maaf kak cumasegitu yg saya tau