16-8=21-x

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Solution for 16-8=21-x equation: 


Simplifying
16 + -8 = 21 + -1x

Combine like terms: 16 + -8 = 8
8 = 21 + -1x

Solving
8 = 21 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
8 + x = 21 + -1x + x

Combine like terms: -1x + x = 0
8 + x = 21 + 0
8 + x = 21

Add '-8' to each side of the equation.
8 + -8 + x = 21 + -8

Combine like terms: 8 + -8 = 0
0 + x = 21 + -8
x = 21 + -8

Combine like terms: 21 + -8 = 13
x = 13

Simplifying
x = 13

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