21=2x+7x-6

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Solution for 21=2x+7x-6 equation:


Simplifying
21 = 2x + 7x + -6

Reorder the terms:
21 = -6 + 2x + 7x

Combine like terms: 2x + 7x = 9x
21 = -6 + 9x

Solving
21 = -6 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
21 + -9x = -6 + 9x + -9x

Combine like terms: 9x + -9x = 0
21 + -9x = -6 + 0
21 + -9x = -6

Add '-21' to each side of the equation.
21 + -21 + -9x = -6 + -21

Combine like terms: 21 + -21 = 0
0 + -9x = -6 + -21
-9x = -6 + -21

Combine like terms: -6 + -21 = -27
-9x = -27

Divide each side by '-9'.
x = 3

Simplifying
x = 3

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