|a-1|=3
|2a+5|>3
3|a-6|+12
1st one, in your head,
a = 4 or a = -2
2. |2a+5| > 3
2a+5 > 3 OR -2a -5> 3
a > -2 OR a < -4
3. looks like a typo , I see neither an equation nor an in-equation.
If it is one of those, first divide both sides by 3, then it is very easy.