Sagot :
À) x=118/41
B) x=17-12=5
C) 3x=17+2
3x=19
X=19/3
D) 2x=5x+3-12
2x=5x-9
2x/5x=9
0,4x=9
X=9/0,4
E) x=2x-1-2
X=2x-3
X/2x=-3
0,5x=-3
X=-3/0,5
X=-6
B) x=17-12=5
C) 3x=17+2
3x=19
X=19/3
D) 2x=5x+3-12
2x=5x-9
2x/5x=9
0,4x=9
X=9/0,4
E) x=2x-1-2
X=2x-3
X/2x=-3
0,5x=-3
X=-3/0,5
X=-6
41x = 118
x = 118/41 (non simplifiable)
12+x = 17
x = 12-17
x = 5
3x-2 = 17
3x = 19
x = 19/3 (non simplifiable)
12+2x = 5x+3
2x-5x = 3-12
-3x=-9
3x=9
x=3
2+x = 2x-1
x-2x = -1-2
-x = -3
x = 3.