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3+6x=16+4x+3-4
We move all terms to the left:
3+6x-(16+4x+3-4)=0
We add all the numbers together, and all the variables
6x-(4x+15)+3=0
We get rid of parentheses
6x-4x-15+3=0
We add all the numbers together, and all the variables
2x-12=0
We move all terms containing x to the left, all other terms to the right
2x=12
x=12/2
x=6
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