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25+a-20+32=20+28 afla numarul necunoscut

Răspuns :

25+a-20+32=20+28 25+a-52=48 25+a=48+52 25+a=100 a=100-25 a=75 25+75-20+32=48 100-52=48
25+a-20+32=48 25+a-20=48-32 25+a-20=16 25+a=20+16 25+a=36 a=36-25 A=11