Step-by-step explanation: Step 1: Flip the equation.
mx−21m=0
Step 2: Factor out variable m.
m(x−21)=0
Step 3: Divide both sides by x-21.
[tex]\frac{m(x-21)}{x-21}[/tex] = [tex]\frac{0}{x-21}[/tex]
So Final Answer: [tex]\frac{0}{x-21}[/tex]
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