90=3w+12w

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Solution for 90=3w+12w equation:


Simplifying
90 = 3w + 12w

Combine like terms: 3w + 12w = 15w
90 = 15w

Solving
90 = 15w

Solving for variable 'w'.

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

Add '-15w' to each side of the equation.
90 + -15w = 15w + -15w

Combine like terms: 15w + -15w = 0
90 + -15w = 0

Add '-90' to each side of the equation.
90 + -90 + -15w = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -15w = 0 + -90
-15w = 0 + -90

Combine like terms: 0 + -90 = -90
-15w = -90

Divide each side by '-15'.
w = 6

Simplifying
w = 6

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