V = l*w*h
20 = 5*w*8
20 = 40*w
divide both sides by 40
20/40 = w
1/2 = w
The width is 1/2 inch
Remember you can do antying to an equaitn as long as you do it to both sides
treat as equaiton, but flip sign when dividng or muliplying by negaitve
isolate x
first distribute
7+3x<u><</u>8(3+x)
7+3x<u><</u>24+8x
minus 3x both sides
7<u><</u>24+5x
minus 24 both sides
-17<u><</u>5x
divide both sides by 5
-17/5<u><</u>x