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x in (-oo:+oo)
(-3/7)*x = 9/10 // - 9/10
(-3/7)*x-(9/10) = 0
(-3/7)*x-9/10 = 0
-3/7*x-9/10 = 0 // + 9/10
-3/7*x = 9/10 // : -3/7
x = 9/10/(-3/7)
x = -21/10
x = -21/10
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