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x = -7
b) 0 = 3x - 5
-3x = -5 / : (-3)
x = 5/3 = 1 2/3
c) 0 = x² - 16 / x² + 1
0 = x² - 16
-x² = -16 / * (-1)
x² = 16
x = √16 = 4
0=x+7
x=7
b)
0=3x-5
3x=-5//:3
x=-1,6