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It's not a quadratic equation. The general form of a quadratic ecuation is:

ax^2+bx+c - the second grade ecuation

We don't have here the unknown therm raised to the second power x² so we would solve the first grade ecuation.

3m+8=15 \\\\ 3m=15-8 \\\\ 3m=7 \\\\ \boxed{m=\frac{7}{3}}
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