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7n-5n=9(n+7)-7(n+10)
We simplify the equation to the form, which is simple to understand
7n-5n=9(n+7)-7(n+10)
Reorder the terms in parentheses
7n-5n=+(+9n+63)-7*(n+10)
Remove unnecessary parentheses
+7n-5n=+9n+63-7+*(+n+10+)
Reorder the terms in parentheses
7n-5n=+9n+63+(-7n-70)
Remove unnecessary parentheses
+7n-5n=+9n+63-7n-70
We move all terms containing n to the left and all other terms to the right.
+7n-5n-9n+7n=+63-70
We simplify left and right side of the equation.
n=-7
0=-7
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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