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-2.1+x/7=-13.3
We move all terms to the left:
-2.1+x/7-(-13.3)=0
We add all the numbers together, and all the variables
x/7+11.2=0
We multiply all the terms by the denominator
x+(11.2)*7=0
We add all the numbers together, and all the variables
x+78.4=0
We move all terms containing x to the left, all other terms to the right
x=-78.4
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