9=a-3a

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Solution for 9=a-3a equation:



9=a-3a
We move all terms to the left:
9-(a-3a)=0
We add all the numbers together, and all the variables
-(-2a)+9=0
We get rid of parentheses
2a+9=0
We move all terms containing a to the left, all other terms to the right
2a=-9
a=-9/2
a=-4+1/2

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