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

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


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

Combine like terms: -13 + -21 = -34
-34 = -3(d + 7) + -10d

Reorder the terms:
-34 = -3(7 + d) + -10d
-34 = (7 * -3 + d * -3) + -10d
-34 = (-21 + -3d) + -10d

Combine like terms: -3d + -10d = -13d
-34 = -21 + -13d

Solving
-34 = -21 + -13d

Solving for variable 'd'.

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

Add '13d' to each side of the equation.
-34 + 13d = -21 + -13d + 13d

Combine like terms: -13d + 13d = 0
-34 + 13d = -21 + 0
-34 + 13d = -21

Add '34' to each side of the equation.
-34 + 34 + 13d = -21 + 34

Combine like terms: -34 + 34 = 0
0 + 13d = -21 + 34
13d = -21 + 34

Combine like terms: -21 + 34 = 13
13d = 13

Divide each side by '13'.
d = 1

Simplifying
d = 1

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