6.2d+1.5a-4d-3.1a=

Solution for 6.2d+1.5a-4d-3.1a= equation:

Simplifying
6.2d + 1.5a + -4d + -3.1a = 0

Reorder the terms:
1.5a + -3.1a + 6.2d + -4d = 0

Combine like terms: 1.5a + -3.1a = -1.6a
-1.6a + 6.2d + -4d = 0

Combine like terms: 6.2d + -4d = 2.2d
-1.6a + 2.2d = 0

Solving
-1.6a + 2.2d = 0

Solving for variable 'a'.

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

Add '-2.2d' to each side of the equation.
-1.6a + 2.2d + -2.2d = 0 + -2.2d

Combine like terms: 2.2d + -2.2d = 0.0
-1.6a + 0.0 = 0 + -2.2d
-1.6a = 0 + -2.2d
Remove the zero:
-1.6a = -2.2d

Divide each side by '-1.6'.
a = 1.375d

Simplifying
a = 1.375d