7y-7z=-21

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Solution for 7y-7z=-21 equation:


Simplifying
7y + -7z = -21

Solving
7y + -7z = -21

Solving for variable 'y'.

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

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

Combine like terms: -7z + 7z = 0
7y + 0 = -21 + 7z
7y = -21 + 7z

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

Simplifying
y = -3 + z

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