Explanation:
(9)
97 = 10x + 27
70 = 10x
x = 7
(11)
-127 = -50x + 23
-150 = -50x
x = 3
(13)
7x + 4 = -38
7x = -42
x = -6
(15)
-8 = -6x - 2
-6 = -6x
x = 1
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