Answer:
n=91
Explain:
mutiply both sides of the equation by 7: 84-n=-7
move constant to the right and change its sign: -n= -7 - 84
find the diffrence= -n= -91
change the signs: n=91
19
Explanation:
12-n/7 = -1
Cross multiply
We have 12-n = -7
Collect like terms
12 + 7 = n
Therefore n = 19
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