42=21+3(x-2)

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Solution for 42=21+3(x-2) equation:


Simplifying
42 = 21 + 3(x + -2)

Reorder the terms:
42 = 21 + 3(-2 + x)
42 = 21 + (-2 * 3 + x * 3)
42 = 21 + (-6 + 3x)

Combine like terms: 21 + -6 = 15
42 = 15 + 3x

Solving
42 = 15 + 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.
42 + -3x = 15 + 3x + -3x

Combine like terms: 3x + -3x = 0
42 + -3x = 15 + 0
42 + -3x = 15

Add '-42' to each side of the equation.
42 + -42 + -3x = 15 + -42

Combine like terms: 42 + -42 = 0
0 + -3x = 15 + -42
-3x = 15 + -42

Combine like terms: 15 + -42 = -27
-3x = -27

Divide each side by '-3'.
x = 9

Simplifying
x = 9

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