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x in (-oo:+oo)
x+30/8 = (1/4)*x // - (1/4)*x
x-((1/4)*x)+30/8 = 0
x+(-1/4)*x+30/8 = 0
3/4*x+15/4 = 0 // - 15/4
3/4*x = -15/4 // : 3/4
x = -15/4/3/4
x = -5
x = -5
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