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Calculati ecuatile:
1) 5x+17=3x-31
2) 2009y=1009y-24000
3) 5(x-7)=3(x-4)-13
Urgent.!! Dau coroana.!!

Răspuns :

Cocirmariadenis
1) 5x+17=3x-31
    5x-3x=-31-17
      2x=-48
      x=(-48):2
      x=-24

2)
2009y=1009y-24000
2009 y-1009 y=-24 000
1000 y=-24 000
y=(-24 000):1000
y=-24

3)
5(x-7)=3(x-4)-13
5x-35=3x-12-13
5x-3x=-25+35
2x=10
x=10:2
x=5

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