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89.4x-6=645
We move all terms to the left:
89.4x-6-(645)=0
We add all the numbers together, and all the variables
89.4x-651=0
We move all terms containing x to the left, all other terms to the right
89.4x=651
x=651/89.4
x=7+21.000000000001/74.500000000004
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