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Afla nr. necunoscut : (78-x)+34=2030-45

Răspuns :

(78-x)+34=2030-45
(78-x)+34=1985
78-x=1985-34=1951
78-1951=x
x=-1873
sau:
78-x+34=2030-45
78+34-2030+45=x
x=-1873