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x in (-oo:+oo)
x/(-5) = -3/4 // + -3/4
x/(-5)-(-3/4) = 0
x/(-5)+3/4 = 0
3/4-1/5*x = 0 // - 3/4
-1/5*x = -3/4 // : -1/5
x = -3/4/(-1/5)
x = 15/4
x = 15/4
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