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-25=-10a+5
We move all terms to the left:
-25-(-10a+5)=0
We get rid of parentheses
10a-5-25=0
We add all the numbers together, and all the variables
10a-30=0
We move all terms containing a to the left, all other terms to the right
10a=30
a=30/10
a=3
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