15+3x=21+x

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Solution for 15+3x=21+x equation:


Simplifying
15 + 3x = 21 + x

Solving
15 + 3x = 21 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
15 + 3x + -1x = 21 + x + -1x

Combine like terms: 3x + -1x = 2x
15 + 2x = 21 + x + -1x

Combine like terms: x + -1x = 0
15 + 2x = 21 + 0
15 + 2x = 21

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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