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-28=7x+7
We move all terms to the left:
-28-(7x+7)=0
We get rid of parentheses
-7x-7-28=0
We add all the numbers together, and all the variables
-7x-35=0
We move all terms containing x to the left, all other terms to the right
-7x=35
x=35/-7
x=-5
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