(-8v+7z)-(-7v+9z)=

Solution for (-8v+7z)-(-7v+9z)= equation:

Simplifying
(-8v + 7z) + -1(-7v + 9z) = 0

Remove parenthesis around (-8v + 7z)
-8v + 7z + -1(-7v + 9z) = 0
-8v + 7z + (-7v * -1 + 9z * -1) = 0
-8v + 7z + (7v + -9z) = 0

Reorder the terms:
-8v + 7v + 7z + -9z = 0

Combine like terms: -8v + 7v = -1v
-1v + 7z + -9z = 0

Combine like terms: 7z + -9z = -2z
-1v + -2z = 0

Solving
-1v + -2z = 0

Solving for variable 'v'.

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

Add '2z' to each side of the equation.
-1v + -2z + 2z = 0 + 2z

Combine like terms: -2z + 2z = 0
-1v + 0 = 0 + 2z
-1v = 0 + 2z
Remove the zero:
-1v = 2z

Divide each side by '-1'.
v = -2z

Simplifying
v = -2z