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4x-84=13x+6
We move all terms to the left:
4x-84-(13x+6)=0
We get rid of parentheses
4x-13x-6-84=0
We add all the numbers together, and all the variables
-9x-90=0
We move all terms containing x to the left, all other terms to the right
-9x=90
x=90/-9
x=-10
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