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x in (-oo:+oo)
x+4 = -3*x-24 // + -3*x-24
x-(-3*x)+4+24 = 0
x+3*x+4+24 = 0
4*x+28 = 0 // - 28
4*x = -28 // : 4
x = -28/4
x = -7
x = -7
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