a-7a+8=21

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Solution for a-7a+8=21 equation: 


Simplifying
a + -7a + 8 = 21

Reorder the terms:
8 + a + -7a = 21

Combine like terms: a + -7a = -6a
8 + -6a = 21

Solving
8 + -6a = 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 + -6a = 21 + -8

Combine like terms: 8 + -8 = 0
0 + -6a = 21 + -8
-6a = 21 + -8

Combine like terms: 21 + -8 = 13
-6a = 13

Divide each side by '-6'.
a = -2.166666667

Simplifying
a = -2.166666667

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