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x+34=5
x+77=13
________,___
3x+12y=21z
pls repede


Răspuns :

x+34=5
x=5-34=-29

x+77=13
x=13-77=-64

3x+12y=21z
3(x+4y)=7z
x+34=5
x=5-34
x= -29

x+77=13
x=13-77
x= - 64

3x+12y=21z /:3
x+4y=7z