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9191919+(x+12122121212)=1919191191911919199
We move all terms to the left:
9191919+(x+12122121212)-(1919191191911919199)=0
We add all the numbers together, and all the variables
(x+12122121212)-1919191191902727280=0
We get rid of parentheses
x+12122121212-1919191191902727280=0
We add all the numbers together, and all the variables
x-1919191179780606068=0
We move all terms containing x to the left, all other terms to the right
x=1919191179780606068
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