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13x-18=9x+3413x=9x+
We move all terms to the left:
13x-18-(9x+3413x)=0
We add all the numbers together, and all the variables
13x-(+3422x)-18=0
We get rid of parentheses
13x-3422x-18=0
We add all the numbers together, and all the variables
-3409x-18=0
We move all terms containing x to the left, all other terms to the right
-3409x=18
x=18/-3409
x=-18/3409
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