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x in (-oo:+oo)
(-5/7)*x = 9/10 // - 9/10
(-5/7)*x-(9/10) = 0
(-5/7)*x-9/10 = 0
-5/7*x-9/10 = 0 // + 9/10
-5/7*x = 9/10 // : -5/7
x = 9/10/(-5/7)
x = -63/50
x = -63/50
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