x+21+2x=18-2x-21

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Solution for x+21+2x=18-2x-21 equation: 


Simplifying
x + 21 + 2x = 18 + -2x + -21

Reorder the terms:
21 + x + 2x = 18 + -2x + -21

Combine like terms: x + 2x = 3x
21 + 3x = 18 + -2x + -21

Reorder the terms:
21 + 3x = 18 + -21 + -2x

Combine like terms: 18 + -21 = -3
21 + 3x = -3 + -2x

Solving
21 + 3x = -3 + -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
21 + 3x + 2x = -3 + -2x + 2x

Combine like terms: 3x + 2x = 5x
21 + 5x = -3 + -2x + 2x

Combine like terms: -2x + 2x = 0
21 + 5x = -3 + 0
21 + 5x = -3

Add '-21' to each side of the equation.
21 + -21 + 5x = -3 + -21

Combine like terms: 21 + -21 = 0
0 + 5x = -3 + -21
5x = -3 + -21

Combine like terms: -3 + -21 = -24
5x = -24

Divide each side by '5'.
x = -4.8

Simplifying
x = -4.8

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