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13x+15=4x-9+15x
We move all terms to the left:
13x+15-(4x-9+15x)=0
We add all the numbers together, and all the variables
13x-(19x-9)+15=0
We get rid of parentheses
13x-19x+9+15=0
We add all the numbers together, and all the variables
-6x+24=0
We move all terms containing x to the left, all other terms to the right
-6x=-24
x=-24/-6
x=+4
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