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1x-2.1x=68.5
We move all terms to the left:
1x-2.1x-(68.5)=0
We add all the numbers together, and all the variables
-1.1x-68.5=0
We move all terms containing x to the left, all other terms to the right
-1.1x=68.5
x=68.5/-1.1
x=-62+0.3/1.1
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