3x+12=-4x-9

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Solution for 3x+12=-4x-9 equation:


Simplifying
3x + 12 = -4x + -9

Reorder the terms:
12 + 3x = -4x + -9

Reorder the terms:
12 + 3x = -9 + -4x

Solving
12 + 3x = -9 + -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.
12 + 3x + 4x = -9 + -4x + 4x

Combine like terms: 3x + 4x = 7x
12 + 7x = -9 + -4x + 4x

Combine like terms: -4x + 4x = 0
12 + 7x = -9 + 0
12 + 7x = -9

Add '-12' to each side of the equation.
12 + -12 + 7x = -9 + -12

Combine like terms: 12 + -12 = 0
0 + 7x = -9 + -12
7x = -9 + -12

Combine like terms: -9 + -12 = -21
7x = -21

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

Simplifying
x = -3

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