Explanation:
a. 9 + 4x = 6x + 17
4x - 6x = 17 - 9
-2x = 8
x = -4
b. 4x - 9 = 6x + 17
4x - 6x = 17 + 9
-2x = 26
x = -13
c. 9 - 4x = 6x + 17
9 - 17 = 6x + 4x
-8 = 10x
x = -8/10
d. 4x + 9 = 6x - 17
4x - 6x = -17 - 9
-2x = -26
x = 13
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