42=3x+21

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Solution for 42=3x+21 equation:


Simplifying
42 = 3x + 21

Reorder the terms:
42 = 21 + 3x

Solving
42 = 21 + 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 = 21 + 3x + -3x

Combine like terms: 3x + -3x = 0
42 + -3x = 21 + 0
42 + -3x = 21

Add '-42' to each side of the equation.
42 + -42 + -3x = 21 + -42

Combine like terms: 42 + -42 = 0
0 + -3x = 21 + -42
-3x = 21 + -42

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

Divide each side by '-3'.
x = 7

Simplifying
x = 7

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