21-15=3(x-1)

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Solution for 21-15=3(x-1) equation:


Simplifying
21 + -15 = 3(x + -1)

Combine like terms: 21 + -15 = 6
6 = 3(x + -1)

Reorder the terms:
6 = 3(-1 + x)
6 = (-1 * 3 + x * 3)
6 = (-3 + 3x)

Solving
6 = -3 + 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.
6 + -3x = -3 + 3x + -3x

Combine like terms: 3x + -3x = 0
6 + -3x = -3 + 0
6 + -3x = -3

Add '-6' to each side of the equation.
6 + -6 + -3x = -3 + -6

Combine like terms: 6 + -6 = 0
0 + -3x = -3 + -6
-3x = -3 + -6

Combine like terms: -3 + -6 = -9
-3x = -9

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

Simplifying
x = 3

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