Răspuns: [tex]\purple{\bf~ \ell = 3~}[/tex]
Explicație pas cu pas:
[tex]\bf \big (4 \cdot \ell +5\big)-6\cdot 2=5[/tex]
[tex]\bf \big (4 \cdot \ell +5\big)-12=5[/tex]
[tex]\bf \big (4 \cdot \ell +5\big)=5+12[/tex]
[tex]\bf 4 \cdot \ell +5 = 17[/tex]
[tex]\bf 4 \cdot \ell = 17-5[/tex]
[tex]\bf 4 \cdot \ell = 12~~~\bigg|:4[/tex]
[tex]\red{\boxed{\bf~ \ell = 3~}}[/tex]
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