10n = 7n + 4 + 2n
so 10n = 9n + 4
Subtract 9n from both sides: n = 4
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10n+2
9 - 5n
I'm assuming you are solving for n.2n + 6 = 7n - 9 {add nine to each side}2n + 15 = 7n { subtract 2n from each side}15 = 5n {divide each side by 5}3 = n
(10, 2)
22n + 2.