21a-7=-1

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Solution for 21a-7=-1 equation: 


Simplifying
21a + -7 = -1

Reorder the terms:
-7 + 21a = -1

Solving
-7 + 21a = -1

Solving for variable 'a'.

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

Add '7' to each side of the equation.
-7 + 7 + 21a = -1 + 7

Combine like terms: -7 + 7 = 0
0 + 21a = -1 + 7
21a = -1 + 7

Combine like terms: -1 + 7 = 6
21a = 6

Divide each side by '21'.
a = 0.2857142857

Simplifying
a = 0.2857142857

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