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6.4x+7-2.1x=32.8
We move all terms to the left:
6.4x+7-2.1x-(32.8)=0
We add all the numbers together, and all the variables
4.3x-25.8=0
We move all terms containing x to the left, all other terms to the right
4.3x=25.8
x=25.8/4.3
x=6+3.5527136788005E-15/4.3
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