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3m - 2n + 4p = 15 m - n + p = 3 m + 4n - 5p = 0 System of equations

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Hello there, Discord. Rainbow Dash is here to help. Isolate any variable in the first equation then plug it to either second or third equation. Does this make sense?
But I made you lose your loyalty and took your wings.
And I could use some clarification

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Other answers:

Saying, I want to isolate m in first equation.\[3m - 2n + 4p = 15\]\[3m = 15 + 2n - 4p\]\[m = \frac{15 + 2n - 4p}{3} = 5 + \frac{2}{3}n - \frac{4}{3}p\] Ok, now I know m. Plug it into second or third equation. Does that make sense?
Wait what does m equal?
\[m = 5 + \frac{2}{3}n - \frac{4}{3}p\]
Oh okay.
You know what to do?
I think so. Lemme try and solve it.

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