Решите урванение: 2/15(b+5)-3/10(5b-1)=4

[latex] \frac{2}{15} (b+5)- \frac{3}{10} (5b-1)=4[/latex] [latex] \frac{2}{15} b+ \frac{2}{3} - \frac{3}{2}[/latex] b+[latex] \frac{3}{10} =4[/latex] [latex] \frac{4}{30} b- \frac{45}{30} b=4- \frac{9}{30} - \frac{20}{30} [/latex] [latex]- \frac{41}{30} b=3 \frac{1}{30} [/latex] [latex]b= \frac{91}{30}* -\frac{30}{41} \\ b= -\frac{91}{41} \\ b=-2 \frac{9}{41} [/latex]