15=3x+3x-21

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Solution for 15=3x+3x-21 equation:


Simplifying
15 = 3x + 3x + -21

Reorder the terms:
15 = -21 + 3x + 3x

Combine like terms: 3x + 3x = 6x
15 = -21 + 6x

Solving
15 = -21 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
15 + -6x = -21 + 6x + -6x

Combine like terms: 6x + -6x = 0
15 + -6x = -21 + 0
15 + -6x = -21

Add '-15' to each side of the equation.
15 + -15 + -6x = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -6x = -21 + -15
-6x = -21 + -15

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

Divide each side by '-6'.
x = 6

Simplifying
x = 6

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