30=3x+21

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Solution for 30=3x+21 equation:


Simplifying
30 = 3x + 21

Reorder the terms:
30 = 21 + 3x

Solving
30 = 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.
30 + -3x = 21 + 3x + -3x

Combine like terms: 3x + -3x = 0
30 + -3x = 21 + 0
30 + -3x = 21

Add '-30' to each side of the equation.
30 + -30 + -3x = 21 + -30

Combine like terms: 30 + -30 = 0
0 + -3x = 21 + -30
-3x = 21 + -30

Combine like terms: 21 + -30 = -9
-3x = -9

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

Simplifying
x = 3

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