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5x=99-4x
We move all terms to the left:
5x-(99-4x)=0
We add all the numbers together, and all the variables
5x-(-4x+99)=0
We get rid of parentheses
5x+4x-99=0
We add all the numbers together, and all the variables
9x-99=0
We move all terms containing x to the left, all other terms to the right
9x=99
x=99/9
x=11
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