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3x+13x=64.
We move all terms to the left:
3x+13x-(64.)=0
We add all the numbers together, and all the variables
3x+13x-64=0
We add all the numbers together, and all the variables
16x-64=0
We move all terms containing x to the left, all other terms to the right
16x=64
x=64/16
x=4
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