21=g-42

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Solution for 21=g-42 equation:


Simplifying
21 = g + -42

Reorder the terms:
21 = -42 + g

Solving
21 = -42 + g

Solving for variable 'g'.

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

Add '-1g' to each side of the equation.
21 + -1g = -42 + g + -1g

Combine like terms: g + -1g = 0
21 + -1g = -42 + 0
21 + -1g = -42

Add '-21' to each side of the equation.
21 + -21 + -1g = -42 + -21

Combine like terms: 21 + -21 = 0
0 + -1g = -42 + -21
-1g = -42 + -21

Combine like terms: -42 + -21 = -63
-1g = -63

Divide each side by '-1'.
g = 63

Simplifying
g = 63

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