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2.1x-6.3=7x-21
We move all terms to the left:
2.1x-6.3-(7x-21)=0
We get rid of parentheses
2.1x-7x+21-6.3=0
We add all the numbers together, and all the variables
-4.9x+14.7=0
We move all terms containing x to the left, all other terms to the right
-4.9x=-14.7
x=-14.7/-4.9
x=2+1/1
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