3x+8=21-x

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Solution for 3x+8=21-x equation:


Simplifying
3x + 8 = 21 + -1x

Reorder the terms:
8 + 3x = 21 + -1x

Solving
8 + 3x = 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 + 3x + x = 21 + -1x + x

Combine like terms: 3x + x = 4x
8 + 4x = 21 + -1x + x

Combine like terms: -1x + x = 0
8 + 4x = 21 + 0
8 + 4x = 21

Add '-8' to each side of the equation.
8 + -8 + 4x = 21 + -8

Combine like terms: 8 + -8 = 0
0 + 4x = 21 + -8
4x = 21 + -8

Combine like terms: 21 + -8 = 13
4x = 13

Divide each side by '4'.
x = 3.25

Simplifying
x = 3.25

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