(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I have a homework question on electrostatic seesaws. My problem is the algebra.

2. Relevant equations

I have been following another example and any guidance to help me proceed would be great.

0= (2q Q)/(4πε_o r²)+(q Q)/(4πε_o r²)-m

0= (3q Q)/(4πε_o r²)-m

m=(3q Q)/(4πε_o r²)

I don't understand line 2. I don't understand how part of the equation has cancelled out. I know there is a step missing so could anyone point me in the right direction.

3. The attempt at a solution

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# Homework Help: Electrostatic algebra

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