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x in (-oo:+oo)
9/8 = 4*x+(2/4)*x // - 4*x+(2/4)*x
9/8-(4*x)-((2/4)*x) = 0
(-1/2)*x-4*x+9/8 = 0
9/8-9/2*x = 0 // - 9/8
-9/2*x = -9/8 // : -9/2
x = -9/8/(-9/2)
x = 1/4
x = 1/4
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