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5a+20-3a=8+2
We move all terms to the left:
5a+20-3a-(8+2)=0
We add all the numbers together, and all the variables
5a-3a+20-10=0
We add all the numbers together, and all the variables
2a+10=0
We move all terms containing a to the left, all other terms to the right
2a=-10
a=-10/2
a=-5
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