salut, besoin d'aide en Équation do type x+b=a; j'suis en 5eme x-(+4)=(-2) (-3,85)+t=(+5,72) t= t+(+2,4)=(+3,1) t= z-(-0,9)=(+5,6) z= y-(+5,4)=(+3,8) y= (-4,7)+

bonsoir

x + 4 = - 2 
x = - 2 - 4
x = - 6 

- 3.85 + t = 5.72
t = 5.72 + 3.85
t = 9.57 

z + 0.9 = 5.6
z = 5.6 - 0.9
z =  4.7

essaies de continuer  

bonsoir
x-(+4)=(-2)
x-4=-2
x=-2+4
x=2

(-3.85)+t=(+5.72)
-3.85+t=5.72
t=5.72+3.85=9.57

t+(+2.4)=(+3.1)
t+2.4=3.1
t=3.1-2.4=0.7

z-(-0.9)=(+5.6)
z+0.9=5.6
z=5.6-0.9
z=4.7

y-(+5.4)=(+3.8)
y-5.4=3.8
y=3.8+5.4=9.2

(-4.7)+z=(1.8)
-4.7+z=1.8
z=1.8+4.7
z=6.5

x-(-10.5)=(-3)
x+10.5=-3
x=-3-10.5=-13.5

t-(+12.45)=(-23.58)
t-12.45=-23.58
t=-23.58+12.45
t=-11.13