Solve for m
m=0
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12m-0=-20m
Multiply 0 and 8 to get 0.
12m-0+20m=0
Add 20m to both sides.
12m+20m=0
Reorder the terms.
32m=0
Combine 12m and 20m to get 32m.
m=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 32 is not equal to 0, m must be equal to 0.
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