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x in (-oo:+oo)
(-5/4)*x+3 = -4 // + 4
(-5/4)*x+3+4 = 0
7-5/4*x = 0 // - 7
-5/4*x = -7 // : -5/4
x = -7/(-5/4)
x = 28/5
x = 28/5
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