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-2.3x-4.2x=-66.3x
We move all terms to the left:
-2.3x-4.2x-(-66.3x)=0
We add all the numbers together, and all the variables
-6.5x-(-66.3x)=0
We get rid of parentheses
-6.5x+66.3x=0
We add all the numbers together, and all the variables
59.8x=0
x=0/59.8
x=0
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