3(a+2)=0.1(-2r-4)

Solution for 3(a+2)=0.1(-2r-4) equation:

Simplifying
3(a + 2) = 0.1(-2r + -4)

Reorder the terms:
3(2 + a) = 0.1(-2r + -4)
(2 * 3 + a * 3) = 0.1(-2r + -4)
(6 + 3a) = 0.1(-2r + -4)

Reorder the terms:
6 + 3a = 0.1(-4 + -2r)
6 + 3a = (-4 * 0.1 + -2r * 0.1)
6 + 3a = (-0.4 + -0.2r)

Solving
6 + 3a = -0.4 + -0.2r

Solving for variable 'a'.

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

Add '-6' to each side of the equation.
6 + -6 + 3a = -0.4 + -6 + -0.2r

Combine like terms: 6 + -6 = 0
0 + 3a = -0.4 + -6 + -0.2r
3a = -0.4 + -6 + -0.2r

Combine like terms: -0.4 + -6 = -6.4
3a = -6.4 + -0.2r

Divide each side by '3'.
a = -2.133333333 + -0.06666666667r

Simplifying
a = -2.133333333 + -0.06666666667r