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21.8=6.4x-3
We move all terms to the left:
21.8-(6.4x-3)=0
We get rid of parentheses
-6.4x+3+21.8=0
We add all the numbers together, and all the variables
-6.4x+24.8=0
We move all terms containing x to the left, all other terms to the right
-6.4x=-24.8
x=-24.8/-6.4
x=3+3.5/4
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