Question

1,2d - 0,5(4d - 1) = -0,7(d - 2) пожалуйста помогите 

Answer 1

1.2d-2d+0.5=-0.7d+1.4
1.2d-2d+0.7d=1.4-0.5
-0.1d=0.9
d=0.9÷(-0.1)
d=-9

Answer 2

0,3n - (2,6 -0,9n) = 5(x - 1) + 7