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6x+x=4x+99
We move all terms to the left:
6x+x-(4x+99)=0
We add all the numbers together, and all the variables
7x-(4x+99)=0
We get rid of parentheses
7x-4x-99=0
We add all the numbers together, and all the variables
3x-99=0
We move all terms containing x to the left, all other terms to the right
3x=99
x=99/3
x=33
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