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x in (-oo:+oo)
0.5*x+7.5 = 3/4 // - 3/4
0.5*x-(3/4)+7.5 = 0
0.5*x-3/4+7.5 = 0
0.5*x+6.75 = 0 // - 6.75
0.5*x = -6.75 // : 0.5
x = -6.75/0.5
x = -13.5
x = -13.5
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