15+3-8=21-m

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Solution for 15+3-8=21-m equation:


Simplifying
15 + 3 + -8 = 21 + -1m

Combine like terms: 15 + 3 = 18
18 + -8 = 21 + -1m

Combine like terms: 18 + -8 = 10
10 = 21 + -1m

Solving
10 = 21 + -1m

Solving for variable 'm'.

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

Add 'm' to each side of the equation.
10 + m = 21 + -1m + m

Combine like terms: -1m + m = 0
10 + m = 21 + 0
10 + m = 21

Add '-10' to each side of the equation.
10 + -10 + m = 21 + -10

Combine like terms: 10 + -10 = 0
0 + m = 21 + -10
m = 21 + -10

Combine like terms: 21 + -10 = 11
m = 11

Simplifying
m = 11

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