a)
[tex]7 - x = 9 | - 7 \\ - x = 2 | \div ( - 1) \\ x = - 2[/tex]
b)
[tex]3 - x = 1 | - 3 \\ - x = - 2 | \div ( - 1) \\ x = 2[/tex]
c)
[tex] - m - 4 = 5 | + 4 \\ - m = 9 | \div ( - 1) \\ m = - 9[/tex]
Odpowiedź:
7 - x = 9
x = 7 - 9
x = -2
spr 7 - (-2) = 9
3 - x = 1
x = 3 - 1
x = 2
spr 3 - 2 = 1
-m - 4 = 5
-m = 5 + 4
-m = 9 : ( -1)
m = -9
