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6x+13+6x+13+2x+3+2x+3=128
We move all terms to the left:
6x+13+6x+13+2x+3+2x+3-(128)=0
We add all the numbers together, and all the variables
16x-96=0
We move all terms containing x to the left, all other terms to the right
16x=96
x=96/16
x=6
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