(-5a-7b)-(-7a-9b)=

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Solution for (-5a-7b)-(-7a-9b)= equation:


Simplifying
(-5a + -7b) + -1(-7a + -9b) = 0

Remove parenthesis around (-5a + -7b)
-5a + -7b + -1(-7a + -9b) = 0
-5a + -7b + (-7a * -1 + -9b * -1) = 0
-5a + -7b + (7a + 9b) = 0

Reorder the terms:
-5a + 7a + -7b + 9b = 0

Combine like terms: -5a + 7a = 2a
2a + -7b + 9b = 0

Combine like terms: -7b + 9b = 2b
2a + 2b = 0

Solving
2a + 2b = 0

Solving for variable 'a'.

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

Add '-2b' to each side of the equation.
2a + 2b + -2b = 0 + -2b

Combine like terms: 2b + -2b = 0
2a + 0 = 0 + -2b
2a = 0 + -2b
Remove the zero:
2a = -2b

Divide each side by '2'.
a = -1b

Simplifying
a = -1b

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