21=2(m-4)+3

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Solution for 21=2(m-4)+3 equation:


Simplifying
21 = 2(m + -4) + 3

Reorder the terms:
21 = 2(-4 + m) + 3
21 = (-4 * 2 + m * 2) + 3
21 = (-8 + 2m) + 3

Reorder the terms:
21 = -8 + 3 + 2m

Combine like terms: -8 + 3 = -5
21 = -5 + 2m

Solving
21 = -5 + 2m

Solving for variable 'm'.

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

Add '-2m' to each side of the equation.
21 + -2m = -5 + 2m + -2m

Combine like terms: 2m + -2m = 0
21 + -2m = -5 + 0
21 + -2m = -5

Add '-21' to each side of the equation.
21 + -21 + -2m = -5 + -21

Combine like terms: 21 + -21 = 0
0 + -2m = -5 + -21
-2m = -5 + -21

Combine like terms: -5 + -21 = -26
-2m = -26

Divide each side by '-2'.
m = 13

Simplifying
m = 13

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