3w-6=-21

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Solution for 3w-6=-21 equation: 


Simplifying
3w + -6 = -21

Reorder the terms:
-6 + 3w = -21

Solving
-6 + 3w = -21

Solving for variable 'w'.

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

Add '6' to each side of the equation.
-6 + 6 + 3w = -21 + 6

Combine like terms: -6 + 6 = 0
0 + 3w = -21 + 6
3w = -21 + 6

Combine like terms: -21 + 6 = -15
3w = -15

Divide each side by '3'.
w = -5

Simplifying
w = -5

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