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repede va rog [2 (5x-7)+19]:3-14=21

Răspuns :

[2 (5x-7)+19]:3-14=21
[2 (5x-7)+19]:3=35
2 (5x-7)+19=105
2 (5x-7)=86
5x-7=43
5x=50
x=50:5
x=10
[2(5x-7)+19]:3-14=21
[(10x-14)+19]:3=35
(10x-14)+19=35*3=105
10x-14=119
10x=123
x=123/10