Réponse :
a. 4(2r - 1) = 7
8r-4=7
8r=7+4
r=11/8
b. -2x + 3 = -2(x - 5)
-2x+3=-2x+10
-2x+2x=10-3
pas de solution
c. -5(4 + 3x) = 2(-x+1)
-20-15x=-2x+2
-15x+2x=2+15
-13x=17
x=-17/13
d. -4x - 10 =-5x - 1
-4x+5x=-1+10
x=9
e. 3/10x+1,4 =-x+2
(3x+14)/10 =(-10x+20)/10
3x+14=-10x+20
3x+10x=20-14
13x=6
x=6/13
f. 6-3x=5-x
-3x+x=5-6
-2x=-1
x=1/2
Explications étape par étape :
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Réponse :
a. 4(2r - 1) = 7
8r-4=7
8r=7+4
r=11/8
b. -2x + 3 = -2(x - 5)
-2x+3=-2x+10
-2x+2x=10-3
pas de solution
c. -5(4 + 3x) = 2(-x+1)
-20-15x=-2x+2
-15x+2x=2+15
-13x=17
x=-17/13
d. -4x - 10 =-5x - 1
-4x+5x=-1+10
x=9
e. 3/10x+1,4 =-x+2
(3x+14)/10 =(-10x+20)/10
3x+14=-10x+20
3x+10x=20-14
13x=6
x=6/13
f. 6-3x=5-x
-3x+x=5-6
-2x=-1
x=1/2
Explications étape par étape :