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c-(306x7)=420 d+(315x8)=12300

Răspuns :

c - ( 306 x7) = 420
c - 2142 = 420
c = 2142 + 420
c = 2562.

d + ( 315 x 8) = 12300
d + 2520 = 12300
d = 12300 - 2520
d = 9780.