12v-13=21v-4

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Solution for 12v-13=21v-4 equation:


Simplifying
12v + -13 = 21v + -4

Reorder the terms:
-13 + 12v = 21v + -4

Reorder the terms:
-13 + 12v = -4 + 21v

Solving
-13 + 12v = -4 + 21v

Solving for variable 'v'.

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

Add '-21v' to each side of the equation.
-13 + 12v + -21v = -4 + 21v + -21v

Combine like terms: 12v + -21v = -9v
-13 + -9v = -4 + 21v + -21v

Combine like terms: 21v + -21v = 0
-13 + -9v = -4 + 0
-13 + -9v = -4

Add '13' to each side of the equation.
-13 + 13 + -9v = -4 + 13

Combine like terms: -13 + 13 = 0
0 + -9v = -4 + 13
-9v = -4 + 13

Combine like terms: -4 + 13 = 9
-9v = 9

Divide each side by '-9'.
v = -1

Simplifying
v = -1

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