Question

2×(Х-4)-1,2×(Х+7)=0,4

Answer 1

2X-8-1.2X-8.4=0.4
0.8X=16.8
X=16.8:0.8
X=168:8
X=21

Answer 2

2x-8-1.2x-8.4-0.4=0
0.8x-88.8=0
0.8x=88.8
x=88.8/0.8
x=111