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13x-144=30x+9
We move all terms to the left:
13x-144-(30x+9)=0
We get rid of parentheses
13x-30x-9-144=0
We add all the numbers together, and all the variables
-17x-153=0
We move all terms containing x to the left, all other terms to the right
-17x=153
x=153/-17
x=-9
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