Verified Answer :

x=7/3y+1/3z , answer

We want to find x in times of y and z, so we want to have only 1 x on the LHS of equation, so
3x-7y=z      /+7z   (add 7z both sides)
3x=z+7z      /:3 (divide 3 both sides)
\(x= \frac{z+7y}{3}\) - its the result.

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