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13x-15=19x+21
We move all terms to the left:
13x-15-(19x+21)=0
We get rid of parentheses
13x-19x-21-15=0
We add all the numbers together, and all the variables
-6x-36=0
We move all terms containing x to the left, all other terms to the right
-6x=36
x=36/-6
x=-6
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