Solve for d
d\leq 262
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-423\geq d-685
Multiply both sides of the equation by -1. Since -1 is negative, the inequality direction is changed.
d-685\leq -423
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
d\leq -423+685
Add 685 to both sides.
d\leq 262
Add -423 and 685 to get 262.
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