Sagot :
Bonjour,
1) 13-5x = 4x-27
13+27 = 4x +5x
40 = 9x
x= 40/9
2) 3x-5/7x+3=3/4
3x -5x/7 = 3/4 -3
21x/7 -5x/7 = 3/4 - 12/4
16x/7 = -9/4
16x = -9/4 * 7
16x = -63/4
x=( -63/4)/16
x= -63/( 4*16)
x= -63 /64
3)3x+1/3-x+1/2=1/6
3x-x = 1/6 -1/3 -1/2
2x = 1/6 -2/6 -3/6
2x =-4/6
2x = -2/3
x= (-2/3) /2
x= -2/( 3*6)
x= -2/18
x= -1/9