21-45=3(x-1)-9

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Solution for 21-45=3(x-1)-9 equation:


Simplifying
21 + -45 = 3(x + -1) + -9

Combine like terms: 21 + -45 = -24
-24 = 3(x + -1) + -9

Reorder the terms:
-24 = 3(-1 + x) + -9
-24 = (-1 * 3 + x * 3) + -9
-24 = (-3 + 3x) + -9

Reorder the terms:
-24 = -3 + -9 + 3x

Combine like terms: -3 + -9 = -12
-24 = -12 + 3x

Solving
-24 = -12 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-24 + -3x = -12 + 3x + -3x

Combine like terms: 3x + -3x = 0
-24 + -3x = -12 + 0
-24 + -3x = -12

Add '24' to each side of the equation.
-24 + 24 + -3x = -12 + 24

Combine like terms: -24 + 24 = 0
0 + -3x = -12 + 24
-3x = -12 + 24

Combine like terms: -12 + 24 = 12
-3x = 12

Divide each side by '-3'.
x = -4

Simplifying
x = -4

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