3+8=2x+21

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Solution for 3+8=2x+21 equation: 


Simplifying
3 + 8 = 2x + 21

Combine like terms: 3 + 8 = 11
11 = 2x + 21

Reorder the terms:
11 = 21 + 2x

Solving
11 = 21 + 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.
11 + -2x = 21 + 2x + -2x

Combine like terms: 2x + -2x = 0
11 + -2x = 21 + 0
11 + -2x = 21

Add '-11' to each side of the equation.
11 + -11 + -2x = 21 + -11

Combine like terms: 11 + -11 = 0
0 + -2x = 21 + -11
-2x = 21 + -11

Combine like terms: 21 + -11 = 10
-2x = 10

Divide each side by '-2'.
x = -5

Simplifying
x = -5

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