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