7x+21=3x-3

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Solution for 7x+21=3x-3 equation:


Simplifying
7x + 21 = 3x + -3

Reorder the terms:
21 + 7x = 3x + -3

Reorder the terms:
21 + 7x = -3 + 3x

Solving
21 + 7x = -3 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + 7x + -3x = -3 + 3x + -3x

Combine like terms: 7x + -3x = 4x
21 + 4x = -3 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + 4x = -3 + 0
21 + 4x = -3

Add '-21' to each side of the equation.
21 + -21 + 4x = -3 + -21

Combine like terms: 21 + -21 = 0
0 + 4x = -3 + -21
4x = -3 + -21

Combine like terms: -3 + -21 = -24
4x = -24

Divide each side by '4'.
x = -6

Simplifying
x = -6

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