Question

Adición y sustracción de números enteros:
Allá el valor de x
1. x + ( -5) = 10
2. x +( -2) = -7
3. ( +2) + x = - 8
4. ( -6) + x = +4
5. ( -9) + ( -3) = x
6. ( -x) + ( +7) = -5
7. ( -x) + ( -1) = -4

Answer 1

1.
X = 10 + 5
X = 15

**
2.
X + (-2) = -7
X = -7 + 2
X = 5

**
3.
(+2) + X = -8
X = -8 - 2
X = - 10

**
4.
(-6) + X = 4
X = 4 + 6
X = 10

**
5.
(-9) + (-3) = X
-X = 9 + 3
-X = 12
X = - 12

**
6.
(-X) + 7 = (-5)
-X = (-5) + 7
-X = 2
X = -2

**
7.
(-X) + (-1) = (-4)
-X = -4 + 1
-X = -3
X = 3