31=-9+4(a+2)

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Solution for 31=-9+4(a+2) equation:


Simplifying
31 = -9 + 4(a + 2)

Reorder the terms:
31 = -9 + 4(2 + a)
31 = -9 + (2 * 4 + a * 4)
31 = -9 + (8 + 4a)

Combine like terms: -9 + 8 = -1
31 = -1 + 4a

Solving
31 = -1 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
31 + -4a = -1 + 4a + -4a

Combine like terms: 4a + -4a = 0
31 + -4a = -1 + 0
31 + -4a = -1

Add '-31' to each side of the equation.
31 + -31 + -4a = -1 + -31

Combine like terms: 31 + -31 = 0
0 + -4a = -1 + -31
-4a = -1 + -31

Combine like terms: -1 + -31 = -32
-4a = -32

Divide each side by '-4'.
a = 8

Simplifying
a = 8

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