-13d-21=3(d+7)-10d

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Solution for -13d-21=3(d+7)-10d equation:


Simplifying
-13d + -21 = 3(d + 7) + -10d

Reorder the terms:
-21 + -13d = 3(d + 7) + -10d

Reorder the terms:
-21 + -13d = 3(7 + d) + -10d
-21 + -13d = (7 * 3 + d * 3) + -10d
-21 + -13d = (21 + 3d) + -10d

Combine like terms: 3d + -10d = -7d
-21 + -13d = 21 + -7d

Solving
-21 + -13d = 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.
-21 + -13d + 7d = 21 + -7d + 7d

Combine like terms: -13d + 7d = -6d
-21 + -6d = 21 + -7d + 7d

Combine like terms: -7d + 7d = 0
-21 + -6d = 21 + 0
-21 + -6d = 21

Add '21' to each side of the equation.
-21 + 21 + -6d = 21 + 21

Combine like terms: -21 + 21 = 0
0 + -6d = 21 + 21
-6d = 21 + 21

Combine like terms: 21 + 21 = 42
-6d = 42

Divide each side by '-6'.
d = -7

Simplifying
d = -7

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