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

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


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

Reorder the terms:
(-7 + -3a) + -1(-1a + 9) = 0

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

Reorder the terms:
-7 + -3a + -1(9 + -1a) = 0
-7 + -3a + (9 * -1 + -1a * -1) = 0
-7 + -3a + (-9 + 1a) = 0

Reorder the terms:
-7 + -9 + -3a + 1a = 0

Combine like terms: -7 + -9 = -16
-16 + -3a + 1a = 0

Combine like terms: -3a + 1a = -2a
-16 + -2a = 0

Solving
-16 + -2a = 0

Solving for variable 'a'.

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

Add '16' to each side of the equation.
-16 + 16 + -2a = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -2a = 0 + 16
-2a = 0 + 16

Combine like terms: 0 + 16 = 16
-2a = 16

Divide each side by '-2'.
a = -8

Simplifying
a = -8

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