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4x-21=15x-4
We move all terms to the left:
4x-21-(15x-4)=0
We get rid of parentheses
4x-15x+4-21=0
We add all the numbers together, and all the variables
-11x-17=0
We move all terms containing x to the left, all other terms to the right
-11x=17
x=17/-11
x=-1+6/11
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