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Aflati-l pe y din: (y+371)×2-235+21=780

Răspuns :

(y+371)×2-235=780-21. (y+371)×2-235=759. (y+371)×2=759+235. (y+371)×2=994. y+371=994:2. y+371=497. y=497-371. y=126
2y+742-235+21=780
2y+507+21=780
2y+528=780
2y=780-528
2y=252
y=252:2
y=126