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160 :8 +800 :5 = X : 3 - 480 :4     

Răspuns :

[tex]160 :8 +800 :5 = x : 3 - 480 :4 \\ Facem~calculele: \\ 20+160= \frac{x}{3}-120 \\ \frac{x}{3}-120=180 |+120 \\ \frac{x}{3}=300|*3 \\ \boxed{x=900} [/tex]