5+7(7-8a)=390

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Solution for 5+7(7-8a)=390 equation: 


Simplifying
5 + 7(7 + -8a) = 390
5 + (7 * 7 + -8a * 7) = 390
5 + (49 + -56a) = 390

Combine like terms: 5 + 49 = 54
54 + -56a = 390

Solving
54 + -56a = 390

Solving for variable 'a'.

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

Add '-54' to each side of the equation.
54 + -54 + -56a = 390 + -54

Combine like terms: 54 + -54 = 0
0 + -56a = 390 + -54
-56a = 390 + -54

Combine like terms: 390 + -54 = 336
-56a = 336

Divide each side by '-56'.
a = -6

Simplifying
a = -6

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