-8a+9-(-3a)=39

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Solution for -8a+9-(-3a)=39 equation:


Simplifying
-8a + 9 + -1(-3a) = 39

Remove parenthesis around (-3a)
-8a + 9 + -1 * -3a = 39

Multiply -1 * -3
-8a + 9 + 3a = 39

Reorder the terms:
9 + -8a + 3a = 39

Combine like terms: -8a + 3a = -5a
9 + -5a = 39

Solving
9 + -5a = 39

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + -5a = 39 + -9

Combine like terms: 9 + -9 = 0
0 + -5a = 39 + -9
-5a = 39 + -9

Combine like terms: 39 + -9 = 30
-5a = 30

Divide each side by '-5'.
a = -6

Simplifying
a = -6

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