1) a - a = 0 + 5 - 7 + 9 = 72) -x + x - 10 + 4 - 20 = -63) c - 8 - 3 - 2 - x = c - 13 - x
1) x + 7 - 10 = 12x - 3 = 12x = 15
2) 8 - x + 4 = 10-x + 12 = 10-x = -2x = 2
3) 5 - 6 - x = 20-1 - x = 20-x = 21x = -21
1) a - a = 0 + 5 - 7 + 9 = 7
2) -x + x - 10 + 4 - 20 = -6
3) c - 8 - 3 - 2 - x = c - 13 - x
1) x + 7 - 10 = 12
x - 3 = 12
x = 15
2) 8 - x + 4 = 10
-x + 12 = 10
-x = -2
x = 2
3) 5 - 6 - x = 20
-1 - x = 20
-x = 21
x = -21