Question

12.98-(3.8х-1.3х)=11.23

Answer 1

12,95-11,23 = (3,8-1,3)*х

(12,95-11,23) / (3,8-1,3) = х

1.72 / 2.5  = х

х = 0,688

Answer 2

12.98-2.5х=11.23
-2.5х=-11.23-12.98
-2.5х=-1.75
Х=0.7