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13x-4x+1=66-2
We move all terms to the left:
13x-4x+1-(66-2)=0
We add all the numbers together, and all the variables
13x-4x+1-64=0
We add all the numbers together, and all the variables
9x-63=0
We move all terms containing x to the left, all other terms to the right
9x=63
x=63/9
x=7
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