21=3(2x-9)

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Solution for 21=3(2x-9) equation:


Simplifying
21 = 3(2x + -9)

Reorder the terms:
21 = 3(-9 + 2x)
21 = (-9 * 3 + 2x * 3)
21 = (-27 + 6x)

Solving
21 = -27 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
21 + -6x = -27 + 6x + -6x

Combine like terms: 6x + -6x = 0
21 + -6x = -27 + 0
21 + -6x = -27

Add '-21' to each side of the equation.
21 + -21 + -6x = -27 + -21

Combine like terms: 21 + -21 = 0
0 + -6x = -27 + -21
-6x = -27 + -21

Combine like terms: -27 + -21 = -48
-6x = -48

Divide each side by '-6'.
x = 8

Simplifying
x = 8

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