tentukan himpunan penyelesaian persamaan berikut ini! A) 2x-5 = 7-x B) 4(a+2) = 2(a-8)

A) 2x-5 = 7-x
2x+x = 7+5
3x = 12
x = 12/3
x = 4

B) 4(a+2) = 2(a-8)
4a+8 = 2a-16
4a-2a = -16-8
2a = -24
a = -24/2
a = -12