Solve for d
d=-54
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-72=-126-d
Multiply both sides of the equation by 9.
-126-d=-72
Swap sides so that all variable terms are on the left hand side.
-d=-72+126
Add 126 to both sides.
-d=54
Add -72 and 126 to get 54.
d=-54
Multiply both sides by -1.
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Matrix
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Limits
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