21=15+4(m-2)

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Solution for 21=15+4(m-2) equation:


Simplifying
21 = 15 + 4(m + -2)

Reorder the terms:
21 = 15 + 4(-2 + m)
21 = 15 + (-2 * 4 + m * 4)
21 = 15 + (-8 + 4m)

Combine like terms: 15 + -8 = 7
21 = 7 + 4m

Solving
21 = 7 + 4m

Solving for variable 'm'.

Move all terms containing m to the left, all other terms to the right.

Add '-4m' to each side of the equation.
21 + -4m = 7 + 4m + -4m

Combine like terms: 4m + -4m = 0
21 + -4m = 7 + 0
21 + -4m = 7

Add '-21' to each side of the equation.
21 + -21 + -4m = 7 + -21

Combine like terms: 21 + -21 = 0
0 + -4m = 7 + -21
-4m = 7 + -21

Combine like terms: 7 + -21 = -14
-4m = -14

Divide each side by '-4'.
m = 3.5

Simplifying
m = 3.5

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