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x in (-oo:+oo)
(-5/7)*x+4/7 = -6/7 // + -6/7
(-5/7)*x+4/7-(-6/7) = 0
(-5/7)*x+4/7+6/7 = 0
10/7-5/7*x = 0 // - 10/7
-5/7*x = -10/7 // : -5/7
x = -10/7/(-5/7)
x = 2
x = 2
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