20=4+8(a-9)

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Solution for 20=4+8(a-9) equation:


Simplifying
20 = 4 + 8(a + -9)

Reorder the terms:
20 = 4 + 8(-9 + a)
20 = 4 + (-9 * 8 + a * 8)
20 = 4 + (-72 + 8a)

Combine like terms: 4 + -72 = -68
20 = -68 + 8a

Solving
20 = -68 + 8a

Solving for variable 'a'.

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

Add '-8a' to each side of the equation.
20 + -8a = -68 + 8a + -8a

Combine like terms: 8a + -8a = 0
20 + -8a = -68 + 0
20 + -8a = -68

Add '-20' to each side of the equation.
20 + -20 + -8a = -68 + -20

Combine like terms: 20 + -20 = 0
0 + -8a = -68 + -20
-8a = -68 + -20

Combine like terms: -68 + -20 = -88
-8a = -88

Divide each side by '-8'.
a = 11

Simplifying
a = 11

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