x = [tex]\frac{k+9}{4}[/tex]
4x - 9 = k
The aim is to make x the subject of the formula.
4x - 9 = k
add 9 to both sides
4x - 9 + 9 = k + 9
4x = k + 9
divide both sides by 4
4x / 4 = k + 9 / 4
Therefore,
x = [tex]\frac{k+9}{4}[/tex]
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