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9x+3=13x-1=90
We move all terms to the left:
9x+3-(13x-1)=0
We get rid of parentheses
9x-13x+1+3=0
We add all the numbers together, and all the variables
-4x+4=0
We move all terms containing x to the left, all other terms to the right
-4x=-4
x=-4/-4
x=1
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