3a+36=21

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Solution for 3a+36=21 equation: 


Simplifying
3a + 36 = 21

Reorder the terms:
36 + 3a = 21

Solving
36 + 3a = 21

Solving for variable 'a'.

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

Add '-36' to each side of the equation.
36 + -36 + 3a = 21 + -36

Combine like terms: 36 + -36 = 0
0 + 3a = 21 + -36
3a = 21 + -36

Combine like terms: 21 + -36 = -15
3a = -15

Divide each side by '3'.
a = -5

Simplifying
a = -5

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