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Aflați x din [2•(5x-7)+19]:3-14=21

Răspuns :

[2•(5x-7)+19]:3-14=21
[2•(5x-7)+19]:3=21 +14
2(5x-7)+19=35x3
10x-14=105-19
10x=86+14
x=100:10
x=10