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Afla numerele x,t si z, stiind ca: y=2×x ;z=y÷4 ; x+y+z=49.

Răspuns :

z=y:4=2x:4
x+2x+2x:4=49
3x+2x=49×4
3x+2x=196
5x=196
x=196:5
x=39,2