20=-9+6(a-7)

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Solution for 20=-9+6(a-7) equation:


Simplifying
20 = -9 + 6(a + -7)

Reorder the terms:
20 = -9 + 6(-7 + a)
20 = -9 + (-7 * 6 + a * 6)
20 = -9 + (-42 + 6a)

Combine like terms: -9 + -42 = -51
20 = -51 + 6a

Solving
20 = -51 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
20 + -6a = -51 + 6a + -6a

Combine like terms: 6a + -6a = 0
20 + -6a = -51 + 0
20 + -6a = -51

Add '-20' to each side of the equation.
20 + -20 + -6a = -51 + -20

Combine like terms: 20 + -20 = 0
0 + -6a = -51 + -20
-6a = -51 + -20

Combine like terms: -51 + -20 = -71
-6a = -71

Divide each side by '-6'.
a = 11.83333333

Simplifying
a = 11.83333333

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