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