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