SOLUTION: solve for the indicated variable a=lw solve for w.

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Initial problem:
a = lw
Move all terms containing w to the left, all other terms to the right.
Add '-1lw' to each side of the equation.
a + -1lw = lw + -1lw
Combine like terms: lw + -1lw = 0
a + -1lw = 0
Add '-1a' to each side of the equation.
a + -1a + -1lw = 0 + -1a
Combine like terms: a + -1a = 0
0 + -1lw = 0 + -1a
-1lw = 0 + -1a
Remove the zero:
-1lw = -1a
Divide each side by '-1l'.
w = al-1
Simplifying
w = al-1
Hope this is what you needed.