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solve for m.

2m - 9 = 21

1 answer

To solve the equation \( 2m - 9 = 21 \), follow these steps:

  1. Add 9 to both sides of the equation: \[ 2m - 9 + 9 = 21 + 9 \] This simplifies to: \[ 2m = 30 \]

  2. Divide both sides by 2 to isolate \( m \): \[ m = \frac{30}{2} \] This simplifies to: \[ m = 15 \]

So, the solution is \( m = 15 \).