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x in (-oo:+oo)
(-8/7)*x = 20 // - 20
(-8/7)*x-20 = 0
-8/7*x-20 = 0 // + 20
-8/7*x = 20 // : -8/7
x = 20/(-8/7)
x = -35/2
x = -35/2
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