In locul casuteti goale poti pune x si obtii:
b) [tex]\frac{5}{9}-\frac{3}{2} =\frac{7}{3}+x[/tex]
Aducem la acelasi numitor, numitorul comun va fi 9x2=18
[tex]\frac{5*2}{9*2}-\frac{3*9}{2*9}=\frac{7*6}{3*6}+\frac{x*18}{18}[/tex]
[tex]\frac{10}{18}-\frac{27}{18}=\frac{42}{18}+\frac{18x}{18}[/tex]
Am obtinut acelasi numitor, deci vom renunta la el.
[tex]10-27=42+18x[/tex]
[tex]-17=42+18x[/tex]
[tex]18x=-17-42[/tex]
[tex]18x=-59[/tex]
[tex]x=-\frac{59}{18}[/tex]
d) Cunoastem [tex]\frac{2}{5} = 0,4[/tex]
-9,83+x=13+0,4
-9,83+x=13,4
Grupam termenii liberi, tinem cont ca ce trece dupa egal isi schimba semnul:
x=13,4+9,83
x=23,23
