-2d-9d-(-15d)=-20

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Solution for -2d-9d-(-15d)=-20 equation: 


Simplifying
-2d + -9d + -1(-15d) = -20

Remove parenthesis around (-15d)
-2d + -9d + -1 * -15d = -20

Multiply -1 * -15
-2d + -9d + 15d = -20

Combine like terms: -2d + -9d = -11d
-11d + 15d = -20

Combine like terms: -11d + 15d = 4d
4d = -20

Solving
4d = -20

Solving for variable 'd'.

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

Divide each side by '4'.
d = -5

Simplifying
d = -5

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