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-0.66x+0.46x=6.4
We move all terms to the left:
-0.66x+0.46x-(6.4)=0
We add all the numbers together, and all the variables
-0.2x-6.4=0
We move all terms containing x to the left, all other terms to the right
-0.2x=6.4
x=6.4/-0.2
x=-32
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