20d+13-12=42

Solution for 20d+13-12=42 equation:

Simplifying
20d + 13 + -12 = 42

Reorder the terms:
13 + -12 + 20d = 42

Combine like terms: 13 + -12 = 1
1 + 20d = 42

Solving
1 + 20d = 42

Solving for variable 'd'.

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

Add '-1' to each side of the equation.
1 + -1 + 20d = 42 + -1

Combine like terms: 1 + -1 = 0
0 + 20d = 42 + -1
20d = 42 + -1

Combine like terms: 42 + -1 = 41
20d = 41

Divide each side by '20'.
d = 2.05

Simplifying
d = 2.05