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Oh, dude, it's like super easy. So, 2n plus 5 is just an algebraic expression where you double the value of n and then add 5 to it. That's it. Nothing crazy, just some basic math.
-2n +7 when n=3?
5m+n = 37 m-2n = 14 => m = 2n+14 Substitute the value of m into the top equation: 5(2n+14)+n = 37 10n+70+n = 37 10n+n = 37-70 11n = -33 Divide both sides by 11 to find the value of n: n = -3 Substitute the value of n into the original equations to find the value of m: Therefore: n = -3 and m = 8
If you mean: 2n = 5-2 then n = 1.5
2n plus 7 equals 19 2n equals 12 n equals 6