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x in (-oo:+oo)
30*x = (1/2)*x-8 // - (1/2)*x-8
30*x-((1/2)*x)+8 = 0
30*x+(-1/2)*x+8 = 0
59/2*x+8 = 0 // - 8
59/2*x = -8 // : 59/2
x = -8/59/2
x = -16/59
x = -16/59
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