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x in (-oo:+oo)
x-1 = (4/7)*x-4 // - (4/7)*x-4
x-((4/7)*x)-1+4 = 0
x+(-4/7)*x-1+4 = 0
3/7*x+3 = 0 // - 3
3/7*x = -3 // : 3/7
x = -3/3/7
x = -7
x = -7
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