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[(10-4×b)÷2×5+25]÷10-5=0

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Răspuns :

[(10-4×b)÷2×5+25]÷10-5=0
[(10-4×b)÷2×5+25]÷10=0+5

[(10-4×b)÷2×5+25]÷10=5
(10-4×b)÷2×5+25=5x10
(10-4×b)÷2×5+25=50
(10-4×b)÷2×5=50-25
(10-4×b)÷2×5=25

(10-4×b)÷2=25:5
(10-4×b)÷2=5
10-4×b=5x2
10-4×b=10
4×b=10 - 10
4×b=0
b=0