-21-2a=6(-7-a)+1

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Solution for -21-2a=6(-7-a)+1 equation:


Simplifying
-21 + -2a = 6(-7 + -1a) + 1
-21 + -2a = (-7 * 6 + -1a * 6) + 1
-21 + -2a = (-42 + -6a) + 1

Reorder the terms:
-21 + -2a = -42 + 1 + -6a

Combine like terms: -42 + 1 = -41
-21 + -2a = -41 + -6a

Solving
-21 + -2a = -41 + -6a

Solving for variable 'a'.

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

Add '6a' to each side of the equation.
-21 + -2a + 6a = -41 + -6a + 6a

Combine like terms: -2a + 6a = 4a
-21 + 4a = -41 + -6a + 6a

Combine like terms: -6a + 6a = 0
-21 + 4a = -41 + 0
-21 + 4a = -41

Add '21' to each side of the equation.
-21 + 21 + 4a = -41 + 21

Combine like terms: -21 + 21 = 0
0 + 4a = -41 + 21
4a = -41 + 21

Combine like terms: -41 + 21 = -20
4a = -20

Divide each side by '4'.
a = -5

Simplifying
a = -5

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