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5x+1+2x=2+1
We move all terms to the left:
5x+1+2x-(2+1)=0
We add all the numbers together, and all the variables
5x+2x+1-3=0
We add all the numbers together, and all the variables
7x-2=0
We move all terms containing x to the left, all other terms to the right
7x=2
x=2/7
x=2/7
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