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5a+8=7a+4
We move all terms to the left:
5a+8-(7a+4)=0
We get rid of parentheses
5a-7a-4+8=0
We add all the numbers together, and all the variables
-2a+4=0
We move all terms containing a to the left, all other terms to the right
-2a=-4
a=-4/-2
a=+2
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