8-7a=-21

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Solution for 8-7a=-21 equation: 


Simplifying
8 + -7a = -21

Solving
8 + -7a = -21

Solving for variable 'a'.

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

Add '-8' to each side of the equation.
8 + -8 + -7a = -21 + -8

Combine like terms: 8 + -8 = 0
0 + -7a = -21 + -8
-7a = -21 + -8

Combine like terms: -21 + -8 = -29
-7a = -29

Divide each side by '-7'.
a = 4.142857143

Simplifying
a = 4.142857143

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