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66=6x-21
We move all terms to the left:
66-(6x-21)=0
We get rid of parentheses
-6x+21+66=0
We add all the numbers together, and all the variables
-6x+87=0
We move all terms containing x to the left, all other terms to the right
-6x=-87
x=-87/-6
x=14+1/2
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