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3.5x-21=0.5x-15
We move all terms to the left:
3.5x-21-(0.5x-15)=0
We get rid of parentheses
3.5x-0.5x+15-21=0
We add all the numbers together, and all the variables
3x-6=0
We move all terms containing x to the left, all other terms to the right
3x=6
x=6/3
x=2
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