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7x=3.5x+50
We move all terms to the left:
7x-(3.5x+50)=0
We get rid of parentheses
7x-3.5x-50=0
We add all the numbers together, and all the variables
3.5x-50=0
We move all terms containing x to the left, all other terms to the right
3.5x=50
x=50/3.5
x=14+1/3.5
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