3x+9=4x-4

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


Simplifying
3x + 9 = 4x + -4

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

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

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

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

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

Add '-9' to each side of the equation.
9 + -9 + -1x = -4 + -9

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

Combine like terms: -4 + -9 = -13
-1x = -13

Divide each side by '-1'.
x = 13

Simplifying
x = 13

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