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a fost răspuns

Aflati x ∈ N astfel incat:
a) 2x+7=11
b)3x-7=11
c)14-x=5.

Răspuns :

a) 2x+7=11
2x=11-7
2x=4
x=4:2
x=2
b)3x-7=11
3x=11-7
3x=4
x=4:3
x=1,(3)
c) 14-x=5
x=14-5
x=9 
ByBrain
a)2x+7=11(=)2x=4(=)x=2
b)3x-7=11(=)3x=18(=)x=6
c)14-x=5(=)-x=-9(=)x=9

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