How to solve that 2x + 30x equals 13.8

How to solve that 2x + 30x equals 13.8


2.3X=13.8
X=6



If - 3.78 = - x + (- 1.78) + 3, what is x equal to


5



If | x | = 9, find the value of X. if | x | = 0, then what is x equal to?