Explicație pas cu pas:
[(9×f-21)÷3+75]÷7=358-74
[(9×f-21)÷3+75]÷7=284
(9×f-21)÷3+75=284×7
(9×f-21)÷3+75=1988
(9×f-21)÷3=1988-75
(9×f-21)÷3=1913
9×f-21=1913×3
9×f-21=5739
9×f=5739+21
9×f=5760
f=5760÷9
f=640
Sper ca te-am ajutat! Mai era ceva dupa "358-74"?