X+13=3x+21

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Solution for X+13=3x+21 equation: 


Simplifying
X + 13 = 3x + 21

Reorder the terms:
13 + X = 3x + 21

Reorder the terms:
13 + X = 21 + 3x

Solving
13 + X = 21 + 3x

Solving for variable 'X'.

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

Add '-13' to each side of the equation.
13 + -13 + X = 21 + -13 + 3x

Combine like terms: 13 + -13 = 0
0 + X = 21 + -13 + 3x
X = 21 + -13 + 3x

Combine like terms: 21 + -13 = 8
X = 8 + 3x

Simplifying
X = 8 + 3x

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