42=2*9+2w

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Solution for 42=2*9+2w equation:


Simplifying
42 = 2 * 9 + 2w

Multiply 2 * 9
42 = 18 + 2w

Solving
42 = 18 + 2w

Solving for variable 'w'.

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

Add '-2w' to each side of the equation.
42 + -2w = 18 + 2w + -2w

Combine like terms: 2w + -2w = 0
42 + -2w = 18 + 0
42 + -2w = 18

Add '-42' to each side of the equation.
42 + -42 + -2w = 18 + -42

Combine like terms: 42 + -42 = 0
0 + -2w = 18 + -42
-2w = 18 + -42

Combine like terms: 18 + -42 = -24
-2w = -24

Divide each side by '-2'.
w = 12

Simplifying
w = 12

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