7(a-8)=21

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Solution for 7(a-8)=21 equation: 


Simplifying
7(a + -8) = 21

Reorder the terms:
7(-8 + a) = 21
(-8 * 7 + a * 7) = 21
(-56 + 7a) = 21

Solving
-56 + 7a = 21

Solving for variable 'a'.

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

Add '56' to each side of the equation.
-56 + 56 + 7a = 21 + 56

Combine like terms: -56 + 56 = 0
0 + 7a = 21 + 56
7a = 21 + 56

Combine like terms: 21 + 56 = 77
7a = 77

Divide each side by '7'.
a = 11

Simplifying
a = 11

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