Répondre :
x+4=20
x=20-4
x=16
4x=302x+1=19
4x-302x=19-1
-208x=18
x=-18/208
x=-9/104
1.5x-32=58
1.5x=58+32
1.5x=90
x=90/1.5
x=60
x-5=17
x=17+5
x=22
x/3=9
x=9*3
x=27
5+3x=26
3x=26-5
3x=21
x=21/3
x=7
2x/5+10=57
2x/5=57-10
2x/5=47
2x=47*5
2x=235
x=235/2
x=117.5
x=20-4
x=16
4x=302x+1=19
4x-302x=19-1
-208x=18
x=-18/208
x=-9/104
1.5x-32=58
1.5x=58+32
1.5x=90
x=90/1.5
x=60
x-5=17
x=17+5
x=22
x/3=9
x=9*3
x=27
5+3x=26
3x=26-5
3x=21
x=21/3
x=7
2x/5+10=57
2x/5=57-10
2x/5=47
2x=47*5
2x=235
x=235/2
x=117.5
x =20 -4 =16
la deuxième est etrange
1.5x = 58+32 =90 ; x = 90/1.5 = 60
x = 17+5 =22
j ai un doute x = 9/3 = 3 ou x = 9*3 = 27
3x = 26-5 = 21; x = 21/3 = 7
2x/5 = 57-10 = 47 ; (x = 47*5 = 235/2 = 117.5) ou( x = 47/5 = 9.4/2 = 4.7)
la deuxième est etrange
1.5x = 58+32 =90 ; x = 90/1.5 = 60
x = 17+5 =22
j ai un doute x = 9/3 = 3 ou x = 9*3 = 27
3x = 26-5 = 21; x = 21/3 = 7
2x/5 = 57-10 = 47 ; (x = 47*5 = 235/2 = 117.5) ou( x = 47/5 = 9.4/2 = 4.7)