Answer:
m = - 4
Explanation:
Given
5m - 10m = 20 ← simplify left side by combining terms
- 5m = 20 ( divide both sides by - 5 )
m=-4
5m-10m=-10m+5m=-(10m-5m)=-5m=20
divide by 5 on both sides, -m=4
miltiply by -1 on both sides, m=-4
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