1.5/(4х-1)=0.4/(х+4)

Решаем пропорцией.

1.5(х+4)=0.4 (4х-1)

1.5х+ 6= 1.6х-0.4

1.5х-1.6х=-0.4-6

-0.1х=-6.4

х= 64

1.5(X+4) = 0.4(4X-1);

1.5X+ 6 = 1.6X-0.4;

1.5X-1.6X = -0.4-6;

-0.1X = -6.4;

X = 64;