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2*2a+3a-1=9
We move all terms to the left:
2*2a+3a-1-(9)=0
We add all the numbers together, and all the variables
3a+2*2a-10=0
Wy multiply elements
3a+4a-10=0
We add all the numbers together, and all the variables
7a-10=0
We move all terms containing a to the left, all other terms to the right
7a=10
a=10/7
a=1+3/7
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