3a+21=87

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Solution for 3a+21=87 equation: 


Simplifying
3a + 21 = 87

Reorder the terms:
21 + 3a = 87

Solving
21 + 3a = 87

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 = 87 + -21

Combine like terms: 21 + -21 = 0
0 + 3a = 87 + -21
3a = 87 + -21

Combine like terms: 87 + -21 = 66
3a = 66

Divide each side by '3'.
a = 22

Simplifying
a = 22

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