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x in (-oo:+oo)
(4/7)*x+1 = 22/21 // - 22/21
(4/7)*x-(22/21)+1 = 0
(4/7)*x-22/21+1 = 0
4/7*x-1/21 = 0 // + 1/21
4/7*x = 1/21 // : 4/7
x = 1/21/4/7
x = 1/12
x = 1/12
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