a) 3(a+b)+(a-2b) b)-4(x-z)-(x+y) c)5(4x-7)+(7-4x) d)(4x-y_-2(x+y) a)6a-15 3 b)12b-9 + 12b-8 3 2 c)5n^{2}-2n- 4n^{2}+40n 8
a) 3(a+b)+(a-2b) b)-4(x-z)-(x+y) c)5(4x-7)+(7-4x) d)(4x-y_-2(x+y) a)6a-15 3 b)12b-9 + 12b-8 3 2 c)5n^{2}-2n- 4n^{2}+40n 8