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a*6+4=13
We move all terms to the left:
a*6+4-(13)=0
We add all the numbers together, and all the variables
a*6-9=0
Wy multiply elements
6a-9=0
We move all terms containing a to the left, all other terms to the right
6a=9
a=9/6
a=1+1/2
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