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[(10-4×b)÷2×5+25]÷10-5=0

Răspuns :

[(10-4×b)÷2×5+25]÷10-5=0 => [(10-4×b)÷2×5+25]÷10=5 => (10-4×b)÷2×5+25= 50 => (10-4×b)÷2×5=25 => 10-4×b=250 => -4b=240 => b= -60