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102=3(-1-7n)
We simplify the equation to the form, which is simple to understand
102=3(-1-7n)
Reorder the terms in parentheses
102=+(-3-21n)
Remove unnecessary parentheses
+102=-3-21n
We move all terms containing n to the left and all other terms to the right.
+21n=-3-102
We simplify left and right side of the equation.
+21n=-105
We divide both sides of the equation by 021 to get n.
n=-5
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