3х(5+12х) - (6х-1)(6х+1)=2.5 х

Question

3х(5+12х) - (6х-1)(6х+1)=2.5 х

Answer 1

15х + 36х²-(36х²+6х-6х-1)-2,5х=0

15х + 36х²- 36х²- 6х + 6х + 1- 2,5х=0

12,5х=-1

х= -1/12,5

х= - 0,08