3-4x=-9-12

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


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

Combine like terms: -9 + -12 = -21
3 + -4x = -21

Solving
3 + -4x = -21

Solving for variable 'x'.

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

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

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

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

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

Simplifying
x = 6

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