Sederhanakan. 2(a - 2b) - 4(3a + 2b)

2(a - 2b) - 4(3a + 2b) = 0
2a - 4b - 12a - 8b = 0
-10a - 12b = 0
-2(5a + 6b) = 0

2(a-2b)-4(3a+2b)=
2a-4b-12a-8b=2a-12a-4b-8b=
-10a-12b=2(-5a-6b)