21=3(4x-5)

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Solution for 21=3(4x-5) equation:


Simplifying
21 = 3(4x + -5)

Reorder the terms:
21 = 3(-5 + 4x)
21 = (-5 * 3 + 4x * 3)
21 = (-15 + 12x)

Solving
21 = -15 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
21 + -12x = -15 + 12x + -12x

Combine like terms: 12x + -12x = 0
21 + -12x = -15 + 0
21 + -12x = -15

Add '-21' to each side of the equation.
21 + -21 + -12x = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -12x = -15 + -21
-12x = -15 + -21

Combine like terms: -15 + -21 = -36
-12x = -36

Divide each side by '-12'.
x = 3

Simplifying
x = 3

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