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(m+4)(m-5)=m^2-25
We move all terms to the left:
(m+4)(m-5)-(m^2-25)=0
We get rid of parentheses
-m^2+(m+4)(m-5)+25=0
We multiply parentheses ..
-m^2+(+m^2-5m+4m-20)+25=0
We add all the numbers together, and all the variables
-1m^2+(+m^2-5m+4m-20)+25=0
We get rid of parentheses
-1m^2+m^2-5m+4m-20+25=0
We add all the numbers together, and all the variables
-1m+5=0
We move all terms containing m to the left, all other terms to the right
-m=-5
m=-5/-1
m=+5
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