78=l+(w+3)

Solution for 78=l+(w+3) equation:

Simplifying
78 = l + (w + 3)

Reorder the terms:
78 = l + (3 + w)

Remove parenthesis around (3 + w)
78 = l + 3 + w

Reorder the terms:
78 = 3 + l + w

Solving
78 = 3 + l + w

Solving for variable 'l'.

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

Add '-1l' to each side of the equation.
78 + -1l = 3 + l + -1l + w

Combine like terms: l + -1l = 0
78 + -1l = 3 + 0 + w
78 + -1l = 3 + w

Add '-78' to each side of the equation.
78 + -78 + -1l = 3 + -78 + w

Combine like terms: 78 + -78 = 0
0 + -1l = 3 + -78 + w
-1l = 3 + -78 + w

Combine like terms: 3 + -78 = -75
-1l = -75 + w

Divide each side by '-1'.
l = 75 + -1w

Simplifying
l = 75 + -1w