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21.3=7.1x
We move all terms to the left:
21.3-(7.1x)=0
We add all the numbers together, and all the variables
-(+7.1x)+21.3=0
We get rid of parentheses
-7.1x+21.3=0
We move all terms containing x to the left, all other terms to the right
-7.1x=-21.3
x=-21.3/-7.1
x=3+3.5527136788005E-15/7.1
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