21=3G+9

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Solution for 21=3G+9 equation:


Simplifying
21 = 3G + 9

Reorder the terms:
21 = 9 + 3G

Solving
21 = 9 + 3G

Solving for variable 'G'.

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

Add '-3G' to each side of the equation.
21 + -3G = 9 + 3G + -3G

Combine like terms: 3G + -3G = 0
21 + -3G = 9 + 0
21 + -3G = 9

Add '-21' to each side of the equation.
21 + -21 + -3G = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -3G = 9 + -21
-3G = 9 + -21

Combine like terms: 9 + -21 = -12
-3G = -12

Divide each side by '-3'.
G = 4

Simplifying
G = 4

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