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x in (-oo:+oo)
(3/4)*x-(1/7) = 0
(3/4)*x-1/7 = 0
3/4*x-1/7 = 0 // + 1/7
3/4*x = 1/7 // : 3/4
x = 1/7/3/4
x = 4/21
x = 4/21
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