[tex]A=LW\ \ \ \ |divide\ both\ sides\ by\ L\\\\W=\frac{A}{L}\\===============\\\\A=8m^2;\ L=4m\\\\W=\frac{8m^2}{4m}=2m^{2-1}=2m[/tex]
A=lW divide both sides by L
W=A / L
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A=8m^2; L=4m
W=(8m^2) / (4m) = 8 / 4 * m^2 / m =2m