c) [latex] frac{1-x}{19}= frac{6}{19}  x= - frac{5}{19} [/latex]b) [latex] frac{7+3-x}{21} = frac{2}{21}  frac{10-x}{21} = frac{2}{21} x= frac{8}{21}  a) [/latex][latex] frac{7+5-x}{18} = frac{2}{18}  frac{12-x}{18} = frac{2}{18} x= frac{10}{18} [/latex]

a)[latex] frac{7}{18} + frac{5}{18} - frac{x}{18}= frac{2}{18} [/latex] [latex] frac{12}{18}- frac{x}{18}= frac{2}{18} [/latex] [latex] frac{x}{18}= frac{12}{18}- frac{2}{18} [/latex] [latex] frac{x}{18}= frac{10}{18} = extgreater x=10[/latex] b)[latex] frac{7}{21} + frac{3}{21}- frac{x}{21}= frac{2}{21} [/latex] [latex] frac{10}{21}- frac{x}{21} = frac{2}{21} [/latex] [latex] frac{x}{21}= frac{10}{21}- frac{2}{21} [/latex] [latex] frac{x}{21}= frac{8}{21}= extgreater x=8 [/latex] c)[latex] frac{1-x}{19}= frac{6}{19} [/latex] [latex]= extgreater 1-x=6 \ x=1-6 \ x=-5[/latex] Verificare(c): 1-x=6=1-(-5)=6 =1+5=6.                                       ~Sper ca te-am ajutat!~