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2.9+4x-1
=9-1+4x
=8+4x
3.4x -8x+12
= -4x +12
4.7-2x-x+5
= 7 +5 -2x -x
=12 -3x
5. 3x² +3y²-5xy+2x²-5y²+6xy
= 3x²+2x²+3y²-5y²-5xy+6xy
= 5x²-2y²+xy
semoga membantu,jangan lupa tinggalkan jejak love (terimakasih), untuk dukungan,follow akun brainly @daltonieen agar gua bisa bantu PR² kalian dilain waktu.
terimakasih.
b. 9+4x-1 = 8+4x
c. 4x-8x+12 = -4x+12
d. 7-2x-x+5 = 12-3x
e. 3x2 + 3y2 - 5xy + 2x2 - 5y2 + 6xy = 5x2-2y2+xy
Semoga membantu ya kak :)