3a-4=15

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Solution for 3a-4=15 equation: 


Simplifying
3a + -4 = 15

Reorder the terms:
-4 + 3a = 15

Solving
-4 + 3a = 15

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 4 + 3a = 15 + 4

Combine like terms: -4 + 4 = 0
0 + 3a = 15 + 4
3a = 15 + 4

Combine like terms: 15 + 4 = 19
3a = 19

Divide each side by '3'.
a = 6.333333333

Simplifying
a = 6.333333333

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