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x in (-oo:+oo)
(-8/7)*x = 3 // - 3
(-8/7)*x-3 = 0
-8/7*x-3 = 0 // + 3
-8/7*x = 3 // : -8/7
x = 3/(-8/7)
x = -21/8
x = -21/8
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