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a fost răspuns

35+7*[(x+10)*3+4*5]-300=85

Răspuns :

35+7*[(x+10)*3+20]=85+300
7*[(x+10)*3+20]=385-35
(x+10)*3+20=350:7
(x+10)*3=50-20
x+10=30:3
x=10-10
x=0