Question

Срочно помогите!!!!!!!!!!!!!!!!!!!!!!

Answer 1

1) 5x=-15     2) -0,4x= -1,8.   3) -3/7x=9/14
x=-15:5           0,4x=1,8         x=9/14:3/7
x=-3                x=1,8:0,4         x=-3/2
                      x= 4,5               x=-1 1/2 или x=-1,5

Answer 2

$5x = - 15 \\ x = - 15 \div 5 \\ x = - 3$

$- 0.4 x= - 1.8 \\ x = - 1.8 \div ( - 0.4) \\ x = - 18 \div ( - 4) \\ x = 4.5$

$- \frac{3}{7} x = \frac{9}{14} \\ x = \frac{9}{14} \div ( - \frac{3}{7} ) \\ x = - \frac{9 \times 7}{14 \times 3} \\ x = - \frac{3}{2} \\ x = - 1 \frac{1}{2} \\ x = - 1.5$