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x in (-oo:+oo)
(3/4)*x = -5/7 // + -5/7
(3/4)*x-(-5/7) = 0
(3/4)*x+5/7 = 0
3/4*x+5/7 = 0 // - 5/7
3/4*x = -5/7 // : 3/4
x = -5/7/3/4
x = -20/21
x = -20/21
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