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X-180+214+318-109=1000

Răspuns :

x-180+214+318-109=1000

x=1000+180-214-318+109

x=1180-532+109

x=648+109

x=757

x - 180 + 214 + 318 - 109 = 1 000

x = 1 000 + 109 - 318 - 214 + 180 → aplic metoda mersului invers

x = 1 109 - 318 - 214 + 180

x = 791 - 214 + 180

x = 577 + 180

x = 757 → numarul