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(8×13+20×6)+a+56:7=300

Răspuns :

(104+120)+a+8=300
224+a+8=300
232+a=300
a=300-232=68
rezolvare:[104+120]+a+8=300,224+a+8=300,224+a=300-8=292,a=292-224,a=68.