2a+21=8a-a

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Solution for 2a+21=8a-a equation:


Simplifying
2a + 21 = 8a + -1a

Reorder the terms:
21 + 2a = 8a + -1a

Combine like terms: 8a + -1a = 7a
21 + 2a = 7a

Solving
21 + 2a = 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
21 + 2a + -7a = 7a + -7a

Combine like terms: 2a + -7a = -5a
21 + -5a = 7a + -7a

Combine like terms: 7a + -7a = 0
21 + -5a = 0

Add '-21' to each side of the equation.
21 + -21 + -5a = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -5a = 0 + -21
-5a = 0 + -21

Combine like terms: 0 + -21 = -21
-5a = -21

Divide each side by '-5'.
a = 4.2

Simplifying
a = 4.2

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