-8(a+7)=-21-3a

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Solution for -8(a+7)=-21-3a equation:


Simplifying
-8(a + 7) = -21 + -3a

Reorder the terms:
-8(7 + a) = -21 + -3a
(7 * -8 + a * -8) = -21 + -3a
(-56 + -8a) = -21 + -3a

Solving
-56 + -8a = -21 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
-56 + -8a + 3a = -21 + -3a + 3a

Combine like terms: -8a + 3a = -5a
-56 + -5a = -21 + -3a + 3a

Combine like terms: -3a + 3a = 0
-56 + -5a = -21 + 0
-56 + -5a = -21

Add '56' to each side of the equation.
-56 + 56 + -5a = -21 + 56

Combine like terms: -56 + 56 = 0
0 + -5a = -21 + 56
-5a = -21 + 56

Combine like terms: -21 + 56 = 35
-5a = 35

Divide each side by '-5'.
a = -7

Simplifying
a = -7

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