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7x-5x=3.5
We move all terms to the left:
7x-5x-(3.5)=0
We add all the numbers together, and all the variables
2x-3.5=0
We move all terms containing x to the left, all other terms to the right
2x=3.5
x=3.5/2
x=1+1/1.3333333333333
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