-7(a-8)=21-2a

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Solution for -7(a-8)=21-2a equation:


Simplifying
-7(a + -8) = 21 + -2a

Reorder the terms:
-7(-8 + a) = 21 + -2a
(-8 * -7 + a * -7) = 21 + -2a
(56 + -7a) = 21 + -2a

Solving
56 + -7a = 21 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
56 + -7a + 2a = 21 + -2a + 2a

Combine like terms: -7a + 2a = -5a
56 + -5a = 21 + -2a + 2a

Combine like terms: -2a + 2a = 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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