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x in (-oo:+oo)
(-3/8)*x = -9/4 // + -9/4
(-3/8)*x-(-9/4) = 0
(-3/8)*x+9/4 = 0
9/4-3/8*x = 0 // - 9/4
-3/8*x = -9/4 // : -3/8
x = -9/4/(-3/8)
x = 6
x = 6
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