Question

a) ( x*3+47)-315=146

Answer 1

(x·3+47)-315=146
(x·3+47)=146+315
x·3+47=461
x·3=461-47
x·3=414
x=414:3=138
x=138

Answer 2

(x*3+47)-315=146....... x*3+47=146+315...........x*3+47=461............x*3=461-47............x*3=414.........x=414:3=138