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x in (-oo:+oo)
(4/7)*x = -1.6 // + 1.6
(4/7)*x+1.6 = 0
4/7*x+1.6 = 0 // - 1.6
4/7*x = -1.6 // : 4/7
x = -1.6/4/7
x = -2.80000001
x = -2.80000001
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