15+2X=21

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Solution for 15+2X=21 equation: 


Simplifying
15 + 2X = 21

Solving
15 + 2X = 21

Solving for variable 'X'.

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

Add '-15' to each side of the equation.
15 + -15 + 2X = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 2X = 21 + -15
2X = 21 + -15

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

Divide each side by '2'.
X = 3

Simplifying
X = 3

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