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6.5x+45.5=91
We move all terms to the left:
6.5x+45.5-(91)=0
We add all the numbers together, and all the variables
6.5x-45.5=0
We move all terms containing x to the left, all other terms to the right
6.5x=45.5
x=45.5/6.5
x=7
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