28=-6+9(a-5)

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Solution for 28=-6+9(a-5) equation: 


Simplifying
28 = -6 + 9(a + -5)

Reorder the terms:
28 = -6 + 9(-5 + a)
28 = -6 + (-5 * 9 + a * 9)
28 = -6 + (-45 + 9a)

Combine like terms: -6 + -45 = -51
28 = -51 + 9a

Solving
28 = -51 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
28 + -9a = -51 + 9a + -9a

Combine like terms: 9a + -9a = 0
28 + -9a = -51 + 0
28 + -9a = -51

Add '-28' to each side of the equation.
28 + -28 + -9a = -51 + -28

Combine like terms: 28 + -28 = 0
0 + -9a = -51 + -28
-9a = -51 + -28

Combine like terms: -51 + -28 = -79
-9a = -79

Divide each side by '-9'.
a = 8.777777778

Simplifying
a = 8.777777778

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