3xy+7z=21

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Solution for 3xy+7z=21 equation: 


Simplifying
3xy + 7z = 21

Solving
3xy + 7z = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-7z' to each side of the equation.
3xy + 7z + -7z = 21 + -7z

Combine like terms: 7z + -7z = 0
3xy + 0 = 21 + -7z
3xy = 21 + -7z

Divide each side by '3y'.
x = 7y-1 + -2.333333333y-1z

Simplifying
x = 7y-1 + -2.333333333y-1z

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