3x+21=7(x+3)-4x

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Solution for 3x+21=7(x+3)-4x equation:


Simplifying
3x + 21 = 7(x + 3) + -4x

Reorder the terms:
21 + 3x = 7(x + 3) + -4x

Reorder the terms:
21 + 3x = 7(3 + x) + -4x
21 + 3x = (3 * 7 + x * 7) + -4x
21 + 3x = (21 + 7x) + -4x

Combine like terms: 7x + -4x = 3x
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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