(7.1х-6.3)-(6.7х-7.9)=0

Question

(7.1х-6.3)-(6.7х-7.9)=0

Answer 1

7.1х-6.3-6.7х+7.9=0
0.4х+1.6=0
0.4х=-1.6
х=-4

Answer 2

7.1x-6.3-6.7x-7.9=0
0.4x-14.2=0
0.4x=14.2
x=35.5