(3a-4b)-(7a+9b)=

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Solution for (3a-4b)-(7a+9b)= equation:


Simplifying
(3a + -4b) + -1(7a + 9b) = 0

Remove parenthesis around (3a + -4b)
3a + -4b + -1(7a + 9b) = 0
3a + -4b + (7a * -1 + 9b * -1) = 0
3a + -4b + (-7a + -9b) = 0

Reorder the terms:
3a + -7a + -4b + -9b = 0

Combine like terms: 3a + -7a = -4a
-4a + -4b + -9b = 0

Combine like terms: -4b + -9b = -13b
-4a + -13b = 0

Solving
-4a + -13b = 0

Solving for variable 'a'.

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

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

Combine like terms: -13b + 13b = 0
-4a + 0 = 0 + 13b
-4a = 0 + 13b
Remove the zero:
-4a = 13b

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

Simplifying
a = -3.25b

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