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