Question

Пропорция: /-дробь 0,3/y+5=0,4/y-8

Answer 1

$\frac{0,3}{y+5} = \frac{0.4}{y-8} \\ \\ 0.4(y+5)=0.3(y-8) \\ 0.4y+2=0.3y - 2.4 \\ 0.4y-0.3y=-2.4-2 \\ 0.1y=-4.4 \\ y=-4.4:0.1 \\ y=-44$