0.1d-0.4=0.7 найти корень уравнения

Question

0.1d-0.4=0.7 найти корень уравнения

Answer 1

0,1d-0.4=0.7
0.1d=1.1
d=1.1/0.1
d=11

Answer 2

0.1d - 0.4 = 0.7
d = 0.4 + 0.7 : 0.1
d = 1.1 : 0.1
d = 11
0.1 * 11 -- 0.4 = 0.7
0.7 = 0.7