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3-18a=-18+3
We move all terms to the left:
3-18a-(-18+3)=0
We add all the numbers together, and all the variables
-18a+3-(-15)=0
We add all the numbers together, and all the variables
-18a+18=0
We move all terms containing a to the left, all other terms to the right
-18a=-18
a=-18/-18
a=1
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