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