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

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


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

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

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

Reorder the terms:
-21 + -13d = -21 + -10a + -3d

Add '21' to each side of the equation.
-21 + 21 + -13d = -21 + -10a + 21 + -3d

Combine like terms: -21 + 21 = 0
0 + -13d = -21 + -10a + 21 + -3d
-13d = -21 + -10a + 21 + -3d

Reorder the terms:
-13d = -21 + 21 + -10a + -3d

Combine like terms: -21 + 21 = 0
-13d = 0 + -10a + -3d
-13d = -10a + -3d

Solving
-13d = -10a + -3d

Solving for variable 'd'.

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

Add '3d' to each side of the equation.
-13d + 3d = -10a + -3d + 3d

Combine like terms: -13d + 3d = -10d
-10d = -10a + -3d + 3d

Combine like terms: -3d + 3d = 0
-10d = -10a + 0
-10d = -10a

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

Simplifying
d = a

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