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8x-4x=7+13=
We move all terms to the left:
8x-4x-(7+13)=0
We add all the numbers together, and all the variables
8x-4x-20=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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