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6x+8=3x+13=4x+15
We move all terms to the left:
6x+8-(3x+13)=0
We get rid of parentheses
6x-3x-13+8=0
We add all the numbers together, and all the variables
3x-5=0
We move all terms containing x to the left, all other terms to the right
3x=5
x=5/3
x=1+2/3
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