7m + 1 = 8m + 9
7m – 8m = 9 – 1
-m = 8
m = -8
– 12x – 3 = 11x – 3
– 12x – 11x = – 3 + 3
x = 0
– 9a + 8 = – 10a – 2
– 9a + 10a = – 2 – 8
a = -10
11 – 5x = 12 – 6x
– 5x + 6x = 12 – 11
x = 1
4k + 7 = – 3 + 5k
4k – 5k = – 3 – 7
-k = -10
k = 10
6 – 2c = 8 – 3c
– 2c + 3c = 8 – 6
c = 2
7m + 1 = 8m + 9
7m – 8m = 9 – 1
-m = 8
m = -8
– 12x – 3 = 11x – 3
– 12x – 11x = – 3 + 3
x = 0
– 9a + 8 = – 10a – 2
– 9a + 10a = – 2 – 8
a = -10
11 – 5x = 12 – 6x
– 5x + 6x = 12 – 11
x = 1
4k + 7 = – 3 + 5k
4k – 5k = – 3 – 7
-k = -10
k = 10
6 – 2c = 8 – 3c
– 2c + 3c = 8 – 6
c = 2