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X in (-oo:+oo)
(4/7)*X = -9/5 // + -9/5
(4/7)*X-(-9/5) = 0
(4/7)*X+9/5 = 0
4/7*X+9/5 = 0 // - 9/5
4/7*X = -9/5 // : 4/7
X = -9/5/4/7
X = -63/20
X = -63/20
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