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8x-2x= 6x
-9y-2y= -11y
-21--14→ -21+14= -7
jadi, 6x-11y-7
1b.3y(y-5x) - 2y²+4xy
→3y²-15xy - 2y²+4xy
→y²-19xy
jadi y²-19xy
1c. 12p²q+8pq-7 - 13p²-2pq-12
→12p²q-13p²+10pq+5
jadi, 12p²q-13p²+10pq+5
2a. 2P+Q+R
2(2x+3)+(-4x-7)+(5x-4)
4x+6-4x-7+5x-4
5x-5
2b. P+Q-2R
(2x+3)+(-4x-7)-2(5x-4)
2x+3-4x-7-10x+8
-12x+4
2c. 3P-{2Q-(Q-2R)}-R
3(2x+3)-{2(-4x-7)-((-4x-7)-2(5x-4))}-5x-4
6x+9-{-8x-14-(-4x-7-10x+8)}-5x-4
6x+9-{-8x-14-(-14x+1)}-5x-4
6x+9-{-8x-14+14x-1}-5x-4
6x+9+8x+14-14x+1-5x-4
-5x-22