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(21/90+22/90)÷(1/2-x)=1
33/90÷(1/2-x)=1 simplificam prima fractie cu 3 ⇒
11/30÷(1/2-x)=1
(1/2-x)=11/30÷1
1/2-x=11/30
x=1/2-11/30
x=15/30-11/30=4/30=2/15
x=2/15