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x+1.09=0.9x
We move all terms to the left:
x+1.09-(0.9x)=0
We add all the numbers together, and all the variables
x-(+0.9x)+1.09=0
We get rid of parentheses
x-0.9x+1.09=0
We add all the numbers together, and all the variables
0.1x+1.09=0
We move all terms containing x to the left, all other terms to the right
0.1x=-1.09
x=-1.09/0.1
x=-10+0.09/0.1
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