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x in (-oo:+oo)
3*x-(6/6) = -4 // + 4
3*x-(6/6)+4 = 0
3*x-1+4 = 0
3*x+3 = 0 // - 3
3*x = -3 // : 3
x = -3/3
x = -1
x = -1
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