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x in (-oo:+oo)
(-3/4)*x = -13/2 // + -13/2
(-3/4)*x-(-13/2) = 0
(-3/4)*x+13/2 = 0
13/2-3/4*x = 0 // - 13/2
-3/4*x = -13/2 // : -3/4
x = -13/2/(-3/4)
x = 26/3
x = 26/3
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