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2(x-15)+2x=345+x
We move all terms to the left:
2(x-15)+2x-(345+x)=0
We add all the numbers together, and all the variables
2(x-15)+2x-(x+345)=0
We add all the numbers together, and all the variables
2x+2(x-15)-(x+345)=0
We multiply parentheses
2x+2x-(x+345)-30=0
We get rid of parentheses
2x+2x-x-345-30=0
We add all the numbers together, and all the variables
3x-375=0
We move all terms containing x to the left, all other terms to the right
3x=375
x=375/3
x=125
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