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7x+13=51.5
We move all terms to the left:
7x+13-(51.5)=0
We add all the numbers together, and all the variables
7x-38.5=0
We move all terms containing x to the left, all other terms to the right
7x=38.5
x=38.5/7
x=5+2.3333333333333/4.6666666666667
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