4x+21=x+30

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Solution for 4x+21=x+30 equation:


Simplifying
4x + 21 = x + 30

Reorder the terms:
21 + 4x = x + 30

Reorder the terms:
21 + 4x = 30 + x

Solving
21 + 4x = 30 + 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.
21 + 4x + -1x = 30 + x + -1x

Combine like terms: 4x + -1x = 3x
21 + 3x = 30 + x + -1x

Combine like terms: x + -1x = 0
21 + 3x = 30 + 0
21 + 3x = 30

Add '-21' to each side of the equation.
21 + -21 + 3x = 30 + -21

Combine like terms: 21 + -21 = 0
0 + 3x = 30 + -21
3x = 30 + -21

Combine like terms: 30 + -21 = 9
3x = 9

Divide each side by '3'.
x = 3

Simplifying
x = 3

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