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a fost răspuns

75:{30-[24×(20-12÷x×3)]÷12+7}+3=8

Răspuns :

75:{30-[24*(20-12÷x*3)]/12+7}+3=8
75:{30-[24*(20-36/x)]/12+7}=8-3
75:{30-[24*(20-36/x)]/12+7}=5
75:5={30-[24*(20-36/x)]/12+7}
15=30-[24*(20-36/x)]/12+7
0=30-[24*(20-36/x)]/12+7-15
22-2(20-36/x)=0
22=2(20-36/x)
22=40-36/x
36/x=40-22
36/x=18
x=36:18
x=2