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-0.64+0.34x=6.3
We move all terms to the left:
-0.64+0.34x-(6.3)=0
We add all the numbers together, and all the variables
0.34x-6.94=0
We move all terms containing x to the left, all other terms to the right
0.34x=6.94
x=6.94/0.34
x=20+0.14/0.34
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