X+9=7x+21

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Solution for X+9=7x+21 equation: 


Simplifying
X + 9 = 7x + 21

Reorder the terms:
9 + X = 7x + 21

Reorder the terms:
9 + X = 21 + 7x

Solving
9 + X = 21 + 7x

Solving for variable 'X'.

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

Add '-9' to each side of the equation.
9 + -9 + X = 21 + -9 + 7x

Combine like terms: 9 + -9 = 0
0 + X = 21 + -9 + 7x
X = 21 + -9 + 7x

Combine like terms: 21 + -9 = 12
X = 12 + 7x

Simplifying
X = 12 + 7x

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