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8.9=x+13(7)
We move all terms to the left:
8.9-(x+13(7))=0
We get rid of parentheses
-x-137+8.9=0
We add all the numbers together, and all the variables
-1x-128.1=0
We move all terms containing x to the left, all other terms to the right
-x=128.1
x=128.1/-1
x=-128+0.1/1
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