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x in (-oo:+oo)
(-2/7)*x = 3/8 // - 3/8
(-2/7)*x-(3/8) = 0
(-2/7)*x-3/8 = 0
-2/7*x-3/8 = 0 // + 3/8
-2/7*x = 3/8 // : -2/7
x = 3/8/(-2/7)
x = -21/16
x = -21/16
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