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16.8=-2.1x-2.1
We move all terms to the left:
16.8-(-2.1x-2.1)=0
We get rid of parentheses
2.1x+2.1+16.8=0
We add all the numbers together, and all the variables
2.1x+18.9=0
We move all terms containing x to the left, all other terms to the right
2.1x=-18.9
x=-18.9/2.1
x=-8+1/1
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