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afla pe x din egalitatea [(x-540:6)x7-100:10] - 100 =30

Răspuns :

(x-90)*7-10=30+100
(x-90)*7=130+10
x-90=140:7
x=20+90
x=110
[(x-90)*7-10]-100=30/+100
(x-90)*7-10=130/+10
(x-90)*7=140/:7
x-90=20/+90
x=110