7x+21=12-4x

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Solution for 7x+21=12-4x equation:


Simplifying
7x + 21 = 12 + -4x

Reorder the terms:
21 + 7x = 12 + -4x

Solving
21 + 7x = 12 + -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
21 + 7x + 4x = 12 + -4x + 4x

Combine like terms: 7x + 4x = 11x
21 + 11x = 12 + -4x + 4x

Combine like terms: -4x + 4x = 0
21 + 11x = 12 + 0
21 + 11x = 12

Add '-21' to each side of the equation.
21 + -21 + 11x = 12 + -21

Combine like terms: 21 + -21 = 0
0 + 11x = 12 + -21
11x = 12 + -21

Combine like terms: 12 + -21 = -9
11x = -9

Divide each side by '11'.
x = -0.8181818182

Simplifying
x = -0.8181818182

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