caranya gimana? tolong dong

a. |2x-6|=8
<=> 2x-6 = 8 atau 2x-6=-8
<=> 2x=14. atau 2x=-2
<=> x = 7. atau. x= -1


c. |x+7|<10
<=> -10<x+7<10
<=> -10-7<x+7-7<10-7
<=> -17<x<3