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x in (-oo:+oo)
(15/8)*x+9/4 = (7/4)*x // - (7/4)*x
(15/8)*x-((7/4)*x)+9/4 = 0
(15/8)*x+(-7/4)*x+9/4 = 0
1/8*x+9/4 = 0 // - 9/4
1/8*x = -9/4 // : 1/8
x = -9/4/1/8
x = -18
x = -18
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