15=x+6+9

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Solution for 15=x+6+9 equation: 


Simplifying
15 = x + 6 + 9

Reorder the terms:
15 = 6 + 9 + x

Combine like terms: 6 + 9 = 15
15 = 15 + x

Add '-15' to each side of the equation.
15 + -15 = 15 + -15 + x

Combine like terms: 15 + -15 = 0
0 = 15 + -15 + x

Combine like terms: 15 + -15 = 0
0 = 0 + x
0 = x

Solving
0 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
0 + -1x = x + -1x
Remove the zero:
-1x = x + -1x

Combine like terms: x + -1x = 0
-1x = 0

Divide each side by '-1'.
x = 0

Simplifying
x = 0

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