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3x+3=19-x
We move all terms to the left:
3x+3-(19-x)=0
We add all the numbers together, and all the variables
3x-(-1x+19)+3=0
We get rid of parentheses
3x+1x-19+3=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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