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x in (-oo:+oo)
(4/7)*x+7 = 29/7 // - 29/7
(4/7)*x-(29/7)+7 = 0
(4/7)*x-29/7+7 = 0
4/7*x+20/7 = 0 // - 20/7
4/7*x = -20/7 // : 4/7
x = -20/7/4/7
x = -5
x = -5
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