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x in (-oo:+oo)
(-6/7)*x = 2.125 // - 2.125
(-6/7)*x-2.125 = 0
-6/7*x-2.125 = 0 // + 2.125
-6/7*x = 2.125 // : -6/7
x = 2.125/(-6/7)
x = -2.47916666
x = -2.47916666
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