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4+66x=3x+13
We move all terms to the left:
4+66x-(3x+13)=0
We get rid of parentheses
66x-3x-13+4=0
We add all the numbers together, and all the variables
63x-9=0
We move all terms containing x to the left, all other terms to the right
63x=9
x=9/63
x=1/7
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