-(a+7)-3(5a+6)=-9

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Solution for -(a+7)-3(5a+6)=-9 equation:


Simplifying
-1(a + 7) + -3(5a + 6) = -9

Reorder the terms:
-1(7 + a) + -3(5a + 6) = -9
(7 * -1 + a * -1) + -3(5a + 6) = -9
(-7 + -1a) + -3(5a + 6) = -9

Reorder the terms:
-7 + -1a + -3(6 + 5a) = -9
-7 + -1a + (6 * -3 + 5a * -3) = -9
-7 + -1a + (-18 + -15a) = -9

Reorder the terms:
-7 + -18 + -1a + -15a = -9

Combine like terms: -7 + -18 = -25
-25 + -1a + -15a = -9

Combine like terms: -1a + -15a = -16a
-25 + -16a = -9

Solving
-25 + -16a = -9

Solving for variable 'a'.

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

Add '25' to each side of the equation.
-25 + 25 + -16a = -9 + 25

Combine like terms: -25 + 25 = 0
0 + -16a = -9 + 25
-16a = -9 + 25

Combine like terms: -9 + 25 = 16
-16a = 16

Divide each side by '-16'.
a = -1

Simplifying
a = -1

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