20+8(a+7)-7=9

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Solution for 20+8(a+7)-7=9 equation:


Simplifying
20 + 8(a + 7) + -7 = 9

Reorder the terms:
20 + 8(7 + a) + -7 = 9
20 + (7 * 8 + a * 8) + -7 = 9
20 + (56 + 8a) + -7 = 9

Reorder the terms:
20 + 56 + -7 + 8a = 9

Combine like terms: 20 + 56 = 76
76 + -7 + 8a = 9

Combine like terms: 76 + -7 = 69
69 + 8a = 9

Solving
69 + 8a = 9

Solving for variable 'a'.

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

Add '-69' to each side of the equation.
69 + -69 + 8a = 9 + -69

Combine like terms: 69 + -69 = 0
0 + 8a = 9 + -69
8a = 9 + -69

Combine like terms: 9 + -69 = -60
8a = -60

Divide each side by '8'.
a = -7.5

Simplifying
a = -7.5

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