3=21-2g

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Solution for 3=21-2g equation:


Simplifying
3 = 21 + -2g

Solving
3 = 21 + -2g

Solving for variable 'g'.

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

Add '2g' to each side of the equation.
3 + 2g = 21 + -2g + 2g

Combine like terms: -2g + 2g = 0
3 + 2g = 21 + 0
3 + 2g = 21

Add '-3' to each side of the equation.
3 + -3 + 2g = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 2g = 21 + -3
2g = 21 + -3

Combine like terms: 21 + -3 = 18
2g = 18

Divide each side by '2'.
g = 9

Simplifying
g = 9

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