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7a-1=50-10a
We move all terms to the left:
7a-1-(50-10a)=0
We add all the numbers together, and all the variables
7a-(-10a+50)-1=0
We get rid of parentheses
7a+10a-50-1=0
We add all the numbers together, and all the variables
17a-51=0
We move all terms containing a to the left, all other terms to the right
17a=51
a=51/17
a=3
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