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51+5(4-a)=61
We move all terms to the left:
51+5(4-a)-(61)=0
We add all the numbers together, and all the variables
5(-1a+4)+51-61=0
We add all the numbers together, and all the variables
5(-1a+4)-10=0
We multiply parentheses
-5a+20-10=0
We add all the numbers together, and all the variables
-5a+10=0
We move all terms containing a to the left, all other terms to the right
-5a=-10
a=-10/-5
a=+2
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