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a) 5x - 3x = 2x

b) 9 + 4x - 1
= 8 + 4x
= 4(2 + x)

c) 4x - 8x + 12
= 12 - 4x
= 4 ( 3 - x)

d) 7 - 2x - x + 5
= 2 - 3x

e) 3x² + 3y² - 5xy + 2x² - 5y² + 6xy
= 5x² - 2y² + xy

a. 5x-3x=(5-3)x
=2x

b. 9+4x-1=4x+9-1
=4x+8

c. 4x-8x+12=(4-8)x+12
=-4x+12

d. 7-2x-x+5=-2x-x+7+5
=(-2-1)x+(7+5) *x=1x*

e. 3x^2+3y^2-5xy+2x^2-5y^2+6xy=3x^2+2x^2+3y^2-5y^2-5xy+6xy=(2+3)x^2+(3-5)y^2+(-5+6)xy=5x^2+(-2y^2)+xy=5x^2-2y^2+xy

Maaf kalau kurang jelas...