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x in (-oo:+oo)
(-5/7)*x-8 = 7 // - 7
(-5/7)*x-8-7 = 0
-5/7*x-15 = 0 // + 15
-5/7*x = 15 // : -5/7
x = 15/(-5/7)
x = -21
x = -21
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