Răspuns:
a+25+25:5=108 <=> a+25+5=108 <=> a=108-25-5 <=> a=78
400-b×4-60=300 <=> -4b=300-400+60 <=> -4b=-40 <=> b=-40:(-4) <=> b=10
(15c+125):50=10 <=> 15c+125=10×50 <=> 15c+125=500 <=> 15c=500-125 <=> 15c=375 <=> c=375:15 <=> c=25
sper că te-am ajutat :))