3x+21=3(x+7)

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Solution for 3x+21=3(x+7) equation: 


Simplifying
3x + 21 = 3(x + 7)

Reorder the terms:
21 + 3x = 3(x + 7)

Reorder the terms:
21 + 3x = 3(7 + x)
21 + 3x = (7 * 3 + x * 3)
21 + 3x = (21 + 3x)

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

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

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

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

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

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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