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10•3+5•[200-3•(242-a•5)]+14•5=470

Răspuns :

UnicornsShow
30+5×[200-3×(242-5a)]+70=470
notam paranteza rotunda cu x
30+5×[200-3x]=470-70
30+5×200-5×3x=400
30+1000-15x=400
1030-400=15x
640=15x
x=640:15
x=42
aflam a
242-5a=42
242-42=5a
200=5a
a=200:5
a=40

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