3x-9=4x+(-12)

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


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

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

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

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

Combine like terms: 3x + -4x = -1x
-9 + -1x = -12 + 4x + -4x

Combine like terms: 4x + -4x = 0
-9 + -1x = -12 + 0
-9 + -1x = -12

Add '9' to each side of the equation.
-9 + 9 + -1x = -12 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = -12 + 9
-1x = -12 + 9

Combine like terms: -12 + 9 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3

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