Steps on applying the opposite operation
A+5=7 -5=2 1.Isolate the Variable
-5 2. Apply the opposite operation
a=2 3. Check your answer
2+5=7
b-3=5 +3=8
+3B=8
B-3=5
8-5=3
5=5
C/3=7
21/3=7
7=7
C=21
4D=16
4+12=16
16=16
D=16
(if their is nothing between to letter(s) or number(s) we suppose that it's multiplication)
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Here's a video about the topic:
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