-8-7a=3(4-a)

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Solution for -8-7a=3(4-a) equation:


Simplifying
-8 + -7a = 3(4 + -1a)
-8 + -7a = (4 * 3 + -1a * 3)
-8 + -7a = (12 + -3a)

Solving
-8 + -7a = 12 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
-8 + -7a + 3a = 12 + -3a + 3a

Combine like terms: -7a + 3a = -4a
-8 + -4a = 12 + -3a + 3a

Combine like terms: -3a + 3a = 0
-8 + -4a = 12 + 0
-8 + -4a = 12

Add '8' to each side of the equation.
-8 + 8 + -4a = 12 + 8

Combine like terms: -8 + 8 = 0
0 + -4a = 12 + 8
-4a = 12 + 8

Combine like terms: 12 + 8 = 20
-4a = 20

Divide each side by '-4'.
a = -5

Simplifying
a = -5

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