4(x-3)-9=15

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Solution for 4(x-3)-9=15 equation: 


Simplifying
4(x + -3) + -9 = 15

Reorder the terms:
4(-3 + x) + -9 = 15
(-3 * 4 + x * 4) + -9 = 15
(-12 + 4x) + -9 = 15

Reorder the terms:
-12 + -9 + 4x = 15

Combine like terms: -12 + -9 = -21
-21 + 4x = 15

Solving
-21 + 4x = 15

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 4x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 4x = 15 + 21
4x = 15 + 21

Combine like terms: 15 + 21 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9

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