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=2x
b.9+4x-1
=9-1+4x
=8+4x
c.4x-8x+12
=-4x+12
d.7-2x-x+5
=7+5-2x-x
=12-3x
e.3x2+3y2-5xy+2x2-5y2+6xy
=3x2+2x2+3y2-5y2-5xy+6xy
=5x2-2y2+xy
= (5-3) x
= 2x
b. 9+4x-1
= 8+4x
= 4(2+x)
c. 4x-8x+12
= -4x+12
= -4(x-3)
d. 7-2x-x+5
= 12-3x
= 3(4-x)
e. 3x²+3y²-5xy+2x²-5y²+6xy
= 5x²-2y²+xy