Contohin ke caranya (-12a+3b-6) – (-10a-2b+5)

(-12a + 3b – 6) – (-10a – 2b + 5)
-12a + 3b – 6 + 10a + 2b – 5
-12a + 10a + 3b + 2b – 6 – 5
-2a + 5b – 11

( – 12a + 3b – 6 ) – ( – 10a – 2b + 5 )
– 12a + 3b – 6 + 10a + 2b – 5
– 2a + 3b – 6 + 2b – 5
– 2a + 5b – 6 – 5
– 2a + 5b – 11