Solve for u
u\neq -3
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2\times 6-3\times 4=0
Variable u cannot be equal to -3 since division by zero is not defined. Multiply both sides of the equation by 6\left(u+3\right), the least common multiple of 3u+9,2u+6.
12-12=0
Do the multiplications.
0=0
Subtract 12 from 12 to get 0.
\text{true}
Compare 0 and 0.
u\in \mathrm{R}
This is true for any u.
u\in \mathrm{R}\setminus -3
Variable u cannot be equal to -3.
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Limits
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