42=5d-21+2d

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Solution for 42=5d-21+2d equation:


Simplifying
42 = 5d + -21 + 2d

Reorder the terms:
42 = -21 + 5d + 2d

Combine like terms: 5d + 2d = 7d
42 = -21 + 7d

Solving
42 = -21 + 7d

Solving for variable 'd'.

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

Add '-7d' to each side of the equation.
42 + -7d = -21 + 7d + -7d

Combine like terms: 7d + -7d = 0
42 + -7d = -21 + 0
42 + -7d = -21

Add '-42' to each side of the equation.
42 + -42 + -7d = -21 + -42

Combine like terms: 42 + -42 = 0
0 + -7d = -21 + -42
-7d = -21 + -42

Combine like terms: -21 + -42 = -63
-7d = -63

Divide each side by '-7'.
d = 9

Simplifying
d = 9

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