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6.3x+20=2.1x-13
We move all terms to the left:
6.3x+20-(2.1x-13)=0
We get rid of parentheses
6.3x-2.1x+13+20=0
We add all the numbers together, and all the variables
4.2x+33=0
We move all terms containing x to the left, all other terms to the right
4.2x=-33
x=-33/4.2
x=-7+2.25/2.625
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