Răspuns :
x- pret initial
x-15x/100=34
100x-15x=3400
85x=3400
x=3400:85
x=40
x-15x/100=34
100x-15x=3400
85x=3400
x=3400:85
x=40
x-15/100=34 ( ''/''-inseamna supra)
100x/100- 15x/100=34
85x/100=34
x=(100*34):85
x=40
100x/100- 15x/100=34
85x/100=34
x=(100*34):85
x=40