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2(9)+8.80+x=29.30
We move all terms to the left:
2(9)+8.80+x-(29.30)=0
We add all the numbers together, and all the variables
x+8.80+29-(29.3)=0
We add all the numbers together, and all the variables
x+8.5=0
We move all terms containing x to the left, all other terms to the right
x=-8.5
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