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3x+13=-x+49
We move all terms to the left:
3x+13-(-x+49)=0
We add all the numbers together, and all the variables
3x-(-1x+49)+13=0
We get rid of parentheses
3x+1x-49+13=0
We add all the numbers together, and all the variables
4x-36=0
We move all terms containing x to the left, all other terms to the right
4x=36
x=36/4
x=9
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