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a2 + b2 = c2 Formula (relating a, b and c)
x/2 + 7 = 0 Not a Formula (just an equation)
Example: Rearrange the volume of a box formula (V = lwh) so that the width is the subject
Start with: V = lwh
divide both sides by h: V/h = lw
divide both sides by l: V/(hl) = w
swap sides: w = V/(hl)
So if we want a box with a volume of 12, a length of 2, and a height of 2, we can calculate its width:
w = V/(hl)
= 12 / (2 × 2)
= 12 / 4
= 3
=