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.99x=10+.89x.x
We move all terms to the left:
.99x-(10+.89x.x)=0
We add all the numbers together, and all the variables
.99x-(.89x.x+10)=0
We get rid of parentheses
.99x-.89x.x-10=0
We move all terms containing x to the left, all other terms to the right
.99x-.89x.x=10
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