3(x-4)=x+9

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


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

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

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

Solving
-12 + 3x = 9 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-12 + 3x + -1x = 9 + x + -1x

Combine like terms: 3x + -1x = 2x
-12 + 2x = 9 + x + -1x

Combine like terms: x + -1x = 0
-12 + 2x = 9 + 0
-12 + 2x = 9

Add '12' to each side of the equation.
-12 + 12 + 2x = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 2x = 9 + 12
2x = 9 + 12

Combine like terms: 9 + 12 = 21
2x = 21

Divide each side by '2'.
x = 10.5

Simplifying
x = 10.5

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