Answer:
-3/10
Step-by-step explanation:
20 times
40 divided by 2
Check attachment for solution
a + 20 = 7*12 (multiplied both sides by 12)
a + 20 = 84 (calculated 7*12)
a = 84 - 20 (subtracted 20 on both sides)
a = 64 (calculated 84-20)
