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3n = -21
n = -7
b) 10 - 4x = 15 - 3x
-3x + 4x = 10 - 15
x = -5
c) -2x + 5 = -x - 9
-x + 2x = 5 + 9
x = 14
d) 18 + 7x = 6x - 8
7x - 6x = -8 - 18
x = -26
e) 6x - 9 - 2 + 2x - x - 3 = 0
7x - 14 = 0
7x = 14
x = 2
7n - 4n = -17 - 4
3n = -21
n = -7
HP = {-7}
b) 2 (5 - 2x) = 3 (5 - x)
10 - 4x = 15 - 3x
10 - 15 = 4x - 3x
-5 = x
HP = {-5}
c) -2x + 5 = -(x + 9)
-2x + 5 = -x - 9
9 + 5 = -x + 2x
14 = x
HP = {14}
d) 18 + 7x = 2(3x - 4)
18 + 7x = 6x - 8
-6x + 7x = -8 - 18
x = -26
HP = {-26}
e) 3(2x - 3) - 2(1 - x) - (x + 3) = 0
6x - 9 - 2 + 2x - x - 3 = 0
7x -14 = 0
7x = 14
x = 2
HP = {2}