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x in (-oo:+oo)
(4/7)*x-(7*x)+1 = -44 // + 44
(4/7)*x-(7*x)+1+44 = 0
(4/7)*x-7*x+1+44 = 0
45-45/7*x = 0 // - 45
-45/7*x = -45 // : -45/7
x = -45/(-45/7)
x = 7
x = 7
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