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8x-28=x-42
We move all terms to the left:
8x-28-(x-42)=0
We get rid of parentheses
8x-x+42-28=0
We add all the numbers together, and all the variables
7x+14=0
We move all terms containing x to the left, all other terms to the right
7x=-14
x=-14/7
x=-2
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