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7x=2.5+80
We move all terms to the left:
7x-(2.5+80)=0
We add all the numbers together, and all the variables
7x-(82.5)=0
We add all the numbers together, and all the variables
7x-82.5=0
We move all terms containing x to the left, all other terms to the right
7x=82.5
x=82.5/7
x=11+3.6666666666667/4.6666666666667
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