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x in (-oo:+oo)
(-7/4)*x+1/4 = -12 // + 12
(-7/4)*x+1/4+12 = 0
49/4-7/4*x = 0 // - 49/4
-7/4*x = -49/4 // : -7/4
x = -49/4/(-7/4)
x = 7
x = 7
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