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x in (-oo:+oo)
(-8/7)*x-(20/7) = 0
(-8/7)*x-20/7 = 0
-8/7*x-20/7 = 0 // + 20/7
-8/7*x = 20/7 // : -8/7
x = 20/7/(-8/7)
x = -5/2
x = -5/2
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