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-2a-25-3a=4a=4a+7
We move all terms to the left:
-2a-25-3a-(4a)=0
We add all the numbers together, and all the variables
-9a-25=0
We move all terms containing a to the left, all other terms to the right
-9a=25
a=25/-9
a=-2+7/9
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