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x in (-oo:+oo)
(-9/4)*x = -7/8 // + -7/8
(-9/4)*x-(-7/8) = 0
(-9/4)*x+7/8 = 0
7/8-9/4*x = 0 // - 7/8
-9/4*x = -7/8 // : -9/4
x = -7/8/(-9/4)
x = 7/18
x = 7/18
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