[x-3+2x-15]=9

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Solution for [x-3+2x-15]=9 equation:


Simplifying
[x + -3 + 2x + -15] = 9

Reorder the terms:
[-3 + -15 + x + 2x] = 9

Combine like terms: -3 + -15 = -18
[-18 + x + 2x] = 9

Combine like terms: x + 2x = 3x
[-18 + 3x] = 9

Remove brackets around [-18 + 3x]
-18 + 3x = 9

Solving
-18 + 3x = 9

Solving for variable 'x'.

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

Add '18' to each side of the equation.
-18 + 18 + 3x = 9 + 18

Combine like terms: -18 + 18 = 0
0 + 3x = 9 + 18
3x = 9 + 18

Combine like terms: 9 + 18 = 27
3x = 27

Divide each side by '3'.
x = 9

Simplifying
x = 9

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