Solve for D
D>-235
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-90-D<145
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
-D<145+90
Add 90 to both sides.
-D<235
Add 145 and 90 to get 235.
D>-235
Divide both sides by -1. Since -1 is negative, the inequality direction is changed.
Examples
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