-v-4(v-9)=21

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Solution for -v-4(v-9)=21 equation: 


Simplifying
-1v + -4(v + -9) = 21

Reorder the terms:
-1v + -4(-9 + v) = 21
-1v + (-9 * -4 + v * -4) = 21
-1v + (36 + -4v) = 21

Reorder the terms:
36 + -1v + -4v = 21

Combine like terms: -1v + -4v = -5v
36 + -5v = 21

Solving
36 + -5v = 21

Solving for variable 'v'.

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

Add '-36' to each side of the equation.
36 + -36 + -5v = 21 + -36

Combine like terms: 36 + -36 = 0
0 + -5v = 21 + -36
-5v = 21 + -36

Combine like terms: 21 + -36 = -15
-5v = -15

Divide each side by '-5'.
v = 3

Simplifying
v = 3

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