Odpowiedź:
x+7=13 /-7
x = 6
6+x= -2 /-6
x = -8
x-4=17 /+4
x = 21
-3+x= -8 /+3
x = -5
4x=36 /:4
x = 9
-3x=24 /:(-3)
x = (-8)
x:5=7 /*5
x = 35
x/-9 = -2 /*(-9)
x = 18
2x+3=15 /-3
2x = 12 /:2
x = 6
5x+13=23 /-12
5x = 10 /:5
x = 2
3x-11=25 /+11
3x = 36 /:3
x = 12
4x-7= 33 /+7
4x = 40 /:4
x = 10
-x+2=8 /-2
-x = 6 /:(-1)
x = -6
-x+5=2 /-5
-x = -3 /:(-1)
x = 3
-5x+3= -12 /-3
-5x = -15 /:(-5)
x = 3
-6x - 3= 15 /+3
-6x = 18 /:(-6)
x = -3
Szczegółowe wyjaśnienie: