Répondre :
bonsoir;
a. 4x-15= x + 1
4x-x = 1+15
3x= 16
x = 16/3
c. 1,2x + 0,3 = 0,4
1,2x = 0,4 -0,3
1,2x = 0,1
x = 0,1/1,2
b. -5x-2= −x + 18
-2 -18 = -x +5x
-20 = 4x
x = -20/4 = -5
d. 2/3 x + 1/5 = 3/4 x +1/3
1/5 -1/3 = 3x/4 -2x/3
3/15 -5/15 = 9x/12 - 8x/12
-2/15 = x/12
x = (-2/1 5 )*12
x = -24/15 = -1,6
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