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20)Determinati numarul natural x care verifica egalitatile:
a)2.x+23=91
b)327-3.x=15+48
c)15+(x+2)+21=47
d)2.x+37=79-15
e)32+(2.x-5)=63+15
 HELP ! Vreau si rezolvarea ,va rog frumos :d.