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2014-10-14T19:54:59+03:00
(x+10)*2-12=78
(x+10)*2=78+12
(x+10)*2=90
x+10=90:2
x+10=45
x=45-10
x=35

x este suma initiala a lui Nicu

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2014-10-14T19:58:22+03:00
[(?+10)x2]-12=78
(?+10)x2=78+12
(?+10)x2=90
?+10=90:2
?+10=45
?=45-10=35 lei