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x+5+2(x-1)=x+19

3(x+2)+3=2x+10


Răspuns :

○ x+5+2(x-1) = x+19

x+5+2x-2 = x+19

x+2x-x = 19+2-5

2x = 16

x = 16:2

x = 8

○ 3(x+2)+3 = 2x+10

3x+6+3 = 2x+10

3x-2x = 10-6-3

x = 1

[tex]x + 5 + 2x - 2 = x + 19 \\ 2x = 16 \\ x = \frac{16}{2} \\ x = 8[/tex]

3x+6=2x+10
x=10-6
x=4