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12x+15=15x+x
We move all terms to the left:
12x+15-(15x+x)=0
We add all the numbers together, and all the variables
12x-(+16x)+15=0
We get rid of parentheses
12x-16x+15=0
We add all the numbers together, and all the variables
-4x+15=0
We move all terms containing x to the left, all other terms to the right
-4x=-15
x=-15/-4
x=3+3/4
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