3x+21=-4x

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Solution for 3x+21=-4x equation:


Simplifying
3x + 21 = -4x

Reorder the terms:
21 + 3x = -4x

Solving
21 + 3x = -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 + 3x + 4x = -4x + 4x

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

Combine like terms: -4x + 4x = 0
21 + 7x = 0

Add '-21' to each side of the equation.
21 + -21 + 7x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7x = 0 + -21
7x = 0 + -21

Combine like terms: 0 + -21 = -21
7x = -21

Divide each side by '7'.
x = -3

Simplifying
x = -3

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