7(-8-5a)=-21

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Solution for 7(-8-5a)=-21 equation: 


Simplifying
7(-8 + -5a) = -21
(-8 * 7 + -5a * 7) = -21
(-56 + -35a) = -21

Solving
-56 + -35a = -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 + -35a = -21 + 56

Combine like terms: -56 + 56 = 0
0 + -35a = -21 + 56
-35a = -21 + 56

Combine like terms: -21 + 56 = 35
-35a = 35

Divide each side by '-35'.
a = -1

Simplifying
a = -1

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