Solve for h
h\geq 21
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h-9\geq 12
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
h\geq 12+9
Add 9 to both sides.
h\geq 21
Add 12 and 9 to get 21.
Examples
Quadratic equation
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Linear equation
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Matrix
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Simultaneous equation
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Limits
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