21-36=6x-9x

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Solution for 21-36=6x-9x equation:


Simplifying
21 + -36 = 6x + -9x

Combine like terms: 21 + -36 = -15
-15 = 6x + -9x

Combine like terms: 6x + -9x = -3x
-15 = -3x

Solving
-15 = -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-15 + 3x = -3x + 3x

Combine like terms: -3x + 3x = 0
-15 + 3x = 0

Add '15' to each side of the equation.
-15 + 15 + 3x = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 3x = 0 + 15
3x = 0 + 15

Combine like terms: 0 + 15 = 15
3x = 15

Divide each side by '3'.
x = 5

Simplifying
x = 5

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