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x in (-oo:+oo)
x+9 = (4/7)*x+66/7 // - (4/7)*x+66/7
x-((4/7)*x)-(66/7)+9 = 0
x+(-4/7)*x-66/7+9 = 0
3/7*x-3/7 = 0 // + 3/7
3/7*x = 3/7 // : 3/7
x = 3/7/3/7
x = 1
x = 1
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