4x+21=18-8x

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Solution for 4x+21=18-8x equation:


Simplifying
4x + 21 = 18 + -8x

Reorder the terms:
21 + 4x = 18 + -8x

Solving
21 + 4x = 18 + -8x

Solving for variable 'x'.

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

Add '8x' to each side of the equation.
21 + 4x + 8x = 18 + -8x + 8x

Combine like terms: 4x + 8x = 12x
21 + 12x = 18 + -8x + 8x

Combine like terms: -8x + 8x = 0
21 + 12x = 18 + 0
21 + 12x = 18

Add '-21' to each side of the equation.
21 + -21 + 12x = 18 + -21

Combine like terms: 21 + -21 = 0
0 + 12x = 18 + -21
12x = 18 + -21

Combine like terms: 18 + -21 = -3
12x = -3

Divide each side by '12'.
x = -0.25

Simplifying
x = -0.25

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