-7d+5d=-30

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Solution for -7d+5d=-30 equation: 


Simplifying
-7d + 5d = -30

Combine like terms: -7d + 5d = -2d
-2d = -30

Solving
-2d = -30

Solving for variable 'd'.

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

Divide each side by '-2'.
d = 15

Simplifying
d = 15

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