-87=-3(4a+5)

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Solution for -87=-3(4a+5) equation:


Simplifying
-87 = -3(4a + 5)

Reorder the terms:
-87 = -3(5 + 4a)
-87 = (5 * -3 + 4a * -3)
-87 = (-15 + -12a)

Solving
-87 = -15 + -12a

Solving for variable 'a'.

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

Add '12a' to each side of the equation.
-87 + 12a = -15 + -12a + 12a

Combine like terms: -12a + 12a = 0
-87 + 12a = -15 + 0
-87 + 12a = -15

Add '87' to each side of the equation.
-87 + 87 + 12a = -15 + 87

Combine like terms: -87 + 87 = 0
0 + 12a = -15 + 87
12a = -15 + 87

Combine like terms: -15 + 87 = 72
12a = 72

Divide each side by '12'.
a = 6

Simplifying
a = 6

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