tentukan pengurangan al jabar a. (10x +3)-(x-8) b.(7x +8)-(2x-7)

a.
(10x + 3) - (x - 8)
= 10x + 3 - x + 8
= 10x - x + 3 + 8
= 9x + 11

b.
(7x + 8) - (2x - 7)
= 7x + 8 - 2x + 7
= 7x - 2x + 8 + 7
= 5x + 15