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4x-13=x-12=90
We move all terms to the left:
4x-13-(x-12)=0
We get rid of parentheses
4x-x+12-13=0
We add all the numbers together, and all the variables
3x-1=0
We move all terms containing x to the left, all other terms to the right
3x=1
x=1/3
x=1/3
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