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x in (-oo:+oo)
(-4/7)*x = 1 // - 1
(-4/7)*x-1 = 0
-4/7*x-1 = 0 // + 1
-4/7*x = 1 // : -4/7
x = 1/(-4/7)
x = -7/4
x = -7/4
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