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2014-02-18T18:11:56+02:00
A=b+30
3(b+30)-b=140
3b+30-b=40
2b=40-30=10
b=10/5
b=2
a=30+2=32
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  • Utilizator Brainly
2014-02-18T18:13:28+02:00
3a-b=140
a-b=30
a=30+b
3(30+b)-b=140
90+3b-b=140
90+2b=140
2b=140-90
2b=50
b=50:2
b=25
a=30+25
a=55
Verificare :  3x55-25=140
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