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7n-28=-7(-3-6)
We move all terms to the left:
7n-28-(-7(-3-6))=0
We add all the numbers together, and all the variables
7n-28-(-7(-9))=0
We add all the numbers together, and all the variables
7n-91=0
We move all terms containing n to the left, all other terms to the right
7n=91
n=91/7
n=13
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