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?x daca a-b=6 x+3a-3b=20

Răspuns :

x+3×(a-b)=20
x+3×6=20
x+18=20 => x=2

Sper ca te-am ajutat!! :)
a-b=6

x+3a-3b=20
x+3×(a-b)=20
x+3×6=20
x+18=20
x=20-18
x=2