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78=-2(2+3)+m
We move all terms to the left:
78-(-2(2+3)+m)=0
We add all the numbers together, and all the variables
-(-25+m)+78=0
We get rid of parentheses
-m+25+78=0
We add all the numbers together, and all the variables
-1m+103=0
We move all terms containing m to the left, all other terms to the right
-m=-103
m=-103/-1
m=+103
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