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{20-2×[8-(4-x)÷(-4)]}×(-7)=-42

Răspuns :

{20-2×[8-(4-x)÷(-4)]}×(-7)=-42

{20-2×[8-(4-x)÷(-4)]}=-42/(-7)

20-2×[8-(4-x)÷(-4)]=6

20-6=2×[8-(4-x)÷(-4)]

2×[8-(4-x)÷(-4)]=14

8-(4-x)÷(-4)=7

8-7=(4-x)÷(-4)

(4-x)÷(-4)=1

4-x=-4

x=8