(x+21)+(2x+9)=18

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Solution for (x+21)+(2x+9)=18 equation:


Simplifying
(x + 21) + (2x + 9) = 18

Reorder the terms:
(21 + x) + (2x + 9) = 18

Remove parenthesis around (21 + x)
21 + x + (2x + 9) = 18

Reorder the terms:
21 + x + (9 + 2x) = 18

Remove parenthesis around (9 + 2x)
21 + x + 9 + 2x = 18

Reorder the terms:
21 + 9 + x + 2x = 18

Combine like terms: 21 + 9 = 30
30 + x + 2x = 18

Combine like terms: x + 2x = 3x
30 + 3x = 18

Solving
30 + 3x = 18

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + 3x = 18 + -30

Combine like terms: 30 + -30 = 0
0 + 3x = 18 + -30
3x = 18 + -30

Combine like terms: 18 + -30 = -12
3x = -12

Divide each side by '3'.
x = -4

Simplifying
x = -4

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