2a+6a-21=20

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Solution for 2a+6a-21=20 equation:


Simplifying
2a + 6a + -21 = 20

Reorder the terms:
-21 + 2a + 6a = 20

Combine like terms: 2a + 6a = 8a
-21 + 8a = 20

Solving
-21 + 8a = 20

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + 8a = 20 + 21

Combine like terms: -21 + 21 = 0
0 + 8a = 20 + 21
8a = 20 + 21

Combine like terms: 20 + 21 = 41
8a = 41

Divide each side by '8'.
a = 5.125

Simplifying
a = 5.125

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