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x in (-oo:+oo)
(-3/7)*x-(9/8) = 0
(-3/7)*x-9/8 = 0
-3/7*x-9/8 = 0 // + 9/8
-3/7*x = 9/8 // : -3/7
x = 9/8/(-3/7)
x = -21/8
x = -21/8
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