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x in (-oo:+oo)
(3/4)*x = -2/7 // + -2/7
(3/4)*x-(-2/7) = 0
(3/4)*x+2/7 = 0
3/4*x+2/7 = 0 // - 2/7
3/4*x = -2/7 // : 3/4
x = -2/7/3/4
x = -8/21
x = -8/21
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