42=2(6+5d)

Solution for 42=2(6+5d) equation:

Simplifying
42 = 2(6 + 5d)
42 = (6 * 2 + 5d * 2)
42 = (12 + 10d)

Solving
42 = 12 + 10d

Solving for variable 'd'.

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

Add '-10d' to each side of the equation.
42 + -10d = 12 + 10d + -10d

Combine like terms: 10d + -10d = 0
42 + -10d = 12 + 0
42 + -10d = 12

Add '-42' to each side of the equation.
42 + -42 + -10d = 12 + -42

Combine like terms: 42 + -42 = 0
0 + -10d = 12 + -42
-10d = 12 + -42

Combine like terms: 12 + -42 = -30
-10d = -30

Divide each side by '-10'.
d = 3

Simplifying
d = 3