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-2.6x-1=-2.1x+3
We move all terms to the left:
-2.6x-1-(-2.1x+3)=0
We get rid of parentheses
-2.6x+2.1x-3-1=0
We add all the numbers together, and all the variables
-0.5x-4=0
We move all terms containing x to the left, all other terms to the right
-0.5x=4
x=4/-0.5
x=-8
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