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7x+8=30+3x+6
We move all terms to the left:
7x+8-(30+3x+6)=0
We add all the numbers together, and all the variables
7x-(3x+36)+8=0
We get rid of parentheses
7x-3x-36+8=0
We add all the numbers together, and all the variables
4x-28=0
We move all terms containing x to the left, all other terms to the right
4x=28
x=28/4
x=7
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