x+2x+x-16=100 svp !!

donc

4x - 16 = 100

4x - 16 + 16 = 100 + 16

4x = 116

4x/4 = 116/4

x = 29

bonsoir

x + 2 x + x - 16 = 100

4 x = 100 + 16

4 x = 116

x =  29