How do I solve for x ?

Do you mean 3/(2x+4)=6/x ?

Divide both sides by 3 and do cross multiplication,

x = 2(2x+4)

Solve for x by collecting variables in one side, and constant in the other side,

3x = -8

Answer: x = -8/3

How do I solve for x ?

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Do you mean 3/(2x+4)=6/x ?

Divide both sides by 3 and do cross multiplication,

x = 2(2x+4)

Solve for x by collecting variables in one side, and constant in the other side,

3x = -8

Answer: x = -8/3