Pake cara no 28,29(plisee buat besok)

28.
5(x-1)-7(x-3) = 2(x+3)
5x-5-7x+21 = 2x+6
5x-7x-5+21 = 2x+6
-2x+16 = 2x+6
-2x-2x = 6-16
-4x = -10
x = -10/-4
x = 10/4
x = 5/2 (c)