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x in (-oo:+oo)
(-7/4)*x = 1/2 // - 1/2
(-7/4)*x-(1/2) = 0
(-7/4)*x-1/2 = 0
-7/4*x-1/2 = 0 // + 1/2
-7/4*x = 1/2 // : -7/4
x = 1/2/(-7/4)
x = -2/7
x = -2/7
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