3(x-1)-9=0

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Solution for 3(x-1)-9=0 equation: 


Simplifying
3(x + -1) + -9 = 0

Reorder the terms:
3(-1 + x) + -9 = 0
(-1 * 3 + x * 3) + -9 = 0
(-3 + 3x) + -9 = 0

Reorder the terms:
-3 + -9 + 3x = 0

Combine like terms: -3 + -9 = -12
-12 + 3x = 0

Solving
-12 + 3x = 0

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 3x = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 3x = 0 + 12
3x = 0 + 12

Combine like terms: 0 + 12 = 12
3x = 12

Divide each side by '3'.
x = 4

Simplifying
x = 4

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