84=2(l+w)

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Solution for 84=2(l+w) equation:


Simplifying
84 = 2(l + w)
84 = (l * 2 + w * 2)
84 = (2l + 2w)

Solving
84 = 2l + 2w

Solving for variable 'l'.

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

Add '-2l' to each side of the equation.
84 + -2l = 2l + -2l + 2w

Combine like terms: 2l + -2l = 0
84 + -2l = 0 + 2w
84 + -2l = 2w

Add '-84' to each side of the equation.
84 + -84 + -2l = -84 + 2w

Combine like terms: 84 + -84 = 0
0 + -2l = -84 + 2w
-2l = -84 + 2w

Divide each side by '-2'.
l = 42 + -1w

Simplifying
l = 42 + -1w

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