3+8v-9v=21

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Solution for 3+8v-9v=21 equation: 


Simplifying
3 + 8v + -9v = 21

Combine like terms: 8v + -9v = -1v
3 + -1v = 21

Solving
3 + -1v = 21

Solving for variable 'v'.

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

Add '-3' to each side of the equation.
3 + -3 + -1v = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -1v = 21 + -3
-1v = 21 + -3

Combine like terms: 21 + -3 = 18
-1v = 18

Divide each side by '-1'.
v = -18

Simplifying
v = -18

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