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x+(1.2xx)=500
We move all terms to the left:
x+(1.2xx)-(500)=0
We add all the numbers together, and all the variables
x+(+1.2xx)-500=0
We get rid of parentheses
x+1.2xx-500=0
We move all terms containing x to the left, all other terms to the right
x+1.2xx=500
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