a) | x + $\frac{3}{4}$ | - $\frac{1}{3}$ = 0
| x + $\frac{3}{4}$ | = 0 + $\frac{1}{3}$
| x + $\frac{3}{4}$ | = $\frac{1}{3}$
TH1 :
x + $\frac{3}{4}$ = $\frac{1}{3}$
x= $\frac{1}{3}$ - $\frac{3}{4}$
x= $\frac{-5}{12}$
TH2:
x + $\frac{3}{4}$ = - $\frac{1}{3}$
x= -$\frac{1}{3}$ - $\frac{3}{4}$
x=- $\frac{13}{12}$
b) | x + 13/7| + | x + 2020/2021| + | x - 1| = 0
x + 13/7 = 0
x= - 13/7
x + 2020/2021 = 0
x= - 2020/2021
x - 1 = 0
x= 1
