Solve for u
u\in \mathrm{R}
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12u+18\geq 12u+18
Use the distributive property to multiply 2 by 6u+9.
12u+18-12u\geq 18
Subtract 12u from both sides.
18\geq 18
Combine 12u and -12u to get 0.
u\in \mathrm{R}
This is true for any u.
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