7.1d-6+4.9d=30

Solution for 7.1d-6+4.9d=30 equation:

Simplifying
7.1d + -6 + 4.9d = 30

Reorder the terms:
-6 + 7.1d + 4.9d = 30

Combine like terms: 7.1d + 4.9d = 12d
-6 + 12d = 30

Solving
-6 + 12d = 30

Solving for variable 'd'.

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

Add '6' to each side of the equation.
-6 + 6 + 12d = 30 + 6

Combine like terms: -6 + 6 = 0
0 + 12d = 30 + 6
12d = 30 + 6

Combine like terms: 30 + 6 = 36
12d = 36

Divide each side by '12'.
d = 3

Simplifying
d = 3