5a-6a=a-21

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Solution for 5a-6a=a-21 equation:


Simplifying
5a + -6a = a + -21

Combine like terms: 5a + -6a = -1a
-1a = a + -21

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

Solving
-1a = -21 + a

Solving for variable 'a'.

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

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

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

Combine like terms: a + -1a = 0
-2a = -21 + 0
-2a = -21

Divide each side by '-2'.
a = 10.5

Simplifying
a = 10.5

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