12/(x+2)=5
z:x+2≠0
x≠-2
D:R\{-2}
12/(x+2)=5 /•(x+2)
12=5(x+2)
12=5x+10
5x+10=12
5x=2 /:5
x=2/5
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12/(x+2)=5
z:x+2≠0
x≠-2
D:R\{-2}
12/(x+2)=5 /•(x+2)
12=5(x+2)
12=5x+10
5x+10=12
5x=2 /:5
x=2/5