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3x-21=7x+5
We move all terms to the left:
3x-21-(7x+5)=0
We get rid of parentheses
3x-7x-5-21=0
We add all the numbers together, and all the variables
-4x-26=0
We move all terms containing x to the left, all other terms to the right
-4x=26
x=26/-4
x=-6+1/2
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