1.
r + 6 = 8
r = 8 - 6
r = 2
2.
3e = 27
e = 9
3.
20 = 4j
5 = j
4.
x - 3 = 9
x = 9 + 3
x = 12
5.
t = 65
6.
5a + 9 = 4a + 15
5a - 4a = 15 - 9
a = 6
7.
7s + 4 = 4s + 5
7s - 4s = 5 - 4
3s = 1
8.
3m + 5 = m + 9
3m - m = 9 - 5
2m = 4
m = 2
9.
5n = 2n + 6
5n - 2n = 6
3n = 6
n = 2
10.
8a = 2a + 30
8a - 2a = 30
6a = 30
a = 5
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Answers & Comments
1.
r + 6 = 8
r = 8 - 6
r = 2
2.
3e = 27
e = 9
3.
20 = 4j
5 = j
4.
x - 3 = 9
x = 9 + 3
x = 12
5.
t = 65
6.
5a + 9 = 4a + 15
5a - 4a = 15 - 9
a = 6
7.
7s + 4 = 4s + 5
7s - 4s = 5 - 4
3s = 1
8.
3m + 5 = m + 9
3m - m = 9 - 5
2m = 4
m = 2
9.
5n = 2n + 6
5n - 2n = 6
3n = 6
n = 2
10.
8a = 2a + 30
8a - 2a = 30
6a = 30
a = 5