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-147=7(-6n-3)
We move all terms to the left:
-147-(7(-6n-3))=0
We calculate terms in parentheses: -(7(-6n-3)), so:We get rid of parentheses
7(-6n-3)
We multiply parentheses
-42n-21
Back to the equation:
-(-42n-21)
42n+21-147=0
We add all the numbers together, and all the variables
42n-126=0
We move all terms containing n to the left, all other terms to the right
42n=126
n=126/42
n=3
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