3+x=21

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Solution for 3+x=21 equation: 


Simplifying
3 + x = 21

Solving
3 + x = 21

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + x = 21 + -3

Combine like terms: 3 + -3 = 0
0 + x = 21 + -3
x = 21 + -3

Combine like terms: 21 + -3 = 18
x = 18

Simplifying
x = 18

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