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x in (-oo:+oo)
(-3/4)*x = -6/7 // + -6/7
(-3/4)*x-(-6/7) = 0
(-3/4)*x+6/7 = 0
6/7-3/4*x = 0 // - 6/7
-3/4*x = -6/7 // : -3/4
x = -6/7/(-3/4)
x = 8/7
x = 8/7
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