3a-21=60

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Solution for 3a-21=60 equation: 


Simplifying
3a + -21 = 60

Reorder the terms:
-21 + 3a = 60

Solving
-21 + 3a = 60

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 + 3a = 60 + 21

Combine like terms: -21 + 21 = 0
0 + 3a = 60 + 21
3a = 60 + 21

Combine like terms: 60 + 21 = 81
3a = 81

Divide each side by '3'.
a = 27

Simplifying
a = 27

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