-ab+21ab-16ab+13=

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Solution for -ab+21ab-16ab+13= equation:


Simplifying
-1ab + 21ab + -16ab + 13 = 0

Reorder the terms:
13 + -1ab + 21ab + -16ab = 0

Combine like terms: -1ab + 21ab = 20ab
13 + 20ab + -16ab = 0

Combine like terms: 20ab + -16ab = 4ab
13 + 4ab = 0

Solving
13 + 4ab = 0

Solving for variable 'a'.

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

Add '-13' to each side of the equation.
13 + -13 + 4ab = 0 + -13

Combine like terms: 13 + -13 = 0
0 + 4ab = 0 + -13
4ab = 0 + -13

Combine like terms: 0 + -13 = -13
4ab = -13

Divide each side by '4b'.
a = -3.25b-1

Simplifying
a = -3.25b-1

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