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-12.78=-2.1x-2.16x
We move all terms to the left:
-12.78-(-2.1x-2.16x)=0
We add all the numbers together, and all the variables
-(-4.26x)-12.78=0
We get rid of parentheses
4.26x-12.78=0
We move all terms containing x to the left, all other terms to the right
4.26x=12.78
x=12.78/4.26
x=3
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