3+a+9a-4=

Solution for 3+a+9a-4= equation:

Simplifying
3 + a + 9a + -4 = 0

Reorder the terms:
3 + -4 + a + 9a = 0

Combine like terms: 3 + -4 = -1
-1 + a + 9a = 0

Combine like terms: a + 9a = 10a
-1 + 10a = 0

Solving
-1 + 10a = 0

Solving for variable 'a'.

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

Add '1' to each side of the equation.
-1 + 1 + 10a = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 10a = 0 + 1
10a = 0 + 1

Combine like terms: 0 + 1 = 1
10a = 1

Divide each side by '10'.
a = 0.1

Simplifying
a = 0.1