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-2.1x=6.3
We move all terms to the left:
-2.1x-(6.3)=0
We add all the numbers together, and all the variables
-2.1x-6.3=0
We move all terms containing x to the left, all other terms to the right
-2.1x=6.3
x=6.3/-2.1
x=-3+-8.8817841970013E-16/2.1
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