21=2x+6

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Solution for 21=2x+6 equation:


Simplifying
21 = 2x + 6

Reorder the terms:
21 = 6 + 2x

Solving
21 = 6 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
21 + -2x = 6 + 2x + -2x

Combine like terms: 2x + -2x = 0
21 + -2x = 6 + 0
21 + -2x = 6

Add '-21' to each side of the equation.
21 + -21 + -2x = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 6 + -21
-2x = 6 + -21

Combine like terms: 6 + -21 = -15
-2x = -15

Divide each side by '-2'.
x = 7.5

Simplifying
x = 7.5

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