x+(x+3)+(x-9)=30

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Solution for x+(x+3)+(x-9)=30 equation:


Simplifying
x + (x + 3) + (x + -9) = 30

Reorder the terms:
x + (3 + x) + (x + -9) = 30

Remove parenthesis around (3 + x)
x + 3 + x + (x + -9) = 30

Reorder the terms:
x + 3 + x + (-9 + x) = 30

Remove parenthesis around (-9 + x)
x + 3 + x + -9 + x = 30

Reorder the terms:
3 + -9 + x + x + x = 30

Combine like terms: 3 + -9 = -6
-6 + x + x + x = 30

Combine like terms: x + x = 2x
-6 + 2x + x = 30

Combine like terms: 2x + x = 3x
-6 + 3x = 30

Solving
-6 + 3x = 30

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + 3x = 30 + 6

Combine like terms: -6 + 6 = 0
0 + 3x = 30 + 6
3x = 30 + 6

Combine like terms: 30 + 6 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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