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2x+1+15=7x+1
We move all terms to the left:
2x+1+15-(7x+1)=0
We add all the numbers together, and all the variables
2x-(7x+1)+16=0
We get rid of parentheses
2x-7x-1+16=0
We add all the numbers together, and all the variables
-5x+15=0
We move all terms containing x to the left, all other terms to the right
-5x=-15
x=-15/-5
x=+3
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