3a+a=-3.6(a-1)

Solution for 3a+a=-3.6(a-1) equation:

Simplifying
3a + a = -3.6(a + -1)

Combine like terms: 3a + a = 4a
4a = -3.6(a + -1)

Reorder the terms:
4a = -3.6(-1 + a)
4a = (-1 * -3.6 + a * -3.6)
4a = (3.6 + -3.6a)

Solving
4a = 3.6 + -3.6a

Solving for variable 'a'.

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

Add '3.6a' to each side of the equation.
4a + 3.6a = 3.6 + -3.6a + 3.6a

Combine like terms: 4a + 3.6a = 7.6a
7.6a = 3.6 + -3.6a + 3.6a

Combine like terms: -3.6a + 3.6a = 0.0
7.6a = 3.6 + 0.0
7.6a = 3.6

Divide each side by '7.6'.
a = 0.4736842105

Simplifying
a = 0.4736842105