Respuesta:
X+11= -18
x= -11/-18
x= 11/18
X-12--13
x= 12+13
x = 25
13 -2 = 31 - X
x= 31-13+2
x= 20
-3x+2=20
3x= 2-20
x= -18/3
17-5-4-3+x-6
x= -17+5+4+3+6
x= -17+18
x=1
2+19-x-2=11
x= 2+19-2-11
x= 21-13
x= 8
(-9).x=72
x=72/-9
x= -8
5x+2=17
5x=17-2
x=15/5
x=3
X.72.63
x= 0
6x:2=3
no entiendo este xd
-21:x=7
x= -3
7x+4= -10
7x=-10-4
x=-14/7
x= -2