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2. 5x + 3y - 2 - (4 - 2{x+3y} ) = 5x + 3y - 2 - (4 - 2x - 6y) = 5x + 3y - 2 - 4 + 2x + 6y
= 7x + 9y - 6
3. (4+2x)(x-8) = 4x - 32 + 2x² - 16x
= 2x² - 12x - 32
menurutku seperti ini
=2x + 5y - 7 + 13x - 2y
=15x - 3y - 7
= (5x + 3y - 2) - ( 4 - 2(x + 3y))
= 5x +3y - 2 -4x - 12y + 2x + 6y
= 5x - 4x + 2x + 3y -12y + 6y -2
= 3x - 3y -2
= (4 + 2x) (x - 8)
= 4x - 32 + 2x² - 16x
= 2x² - 12x - 32