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x in (-oo:+oo)
-((4/7)*x)-1 = -25/21 // + -25/21
-((4/7)*x)-(-25/21)-1 = 0
(-4/7)*x+25/21-1 = 0
4/21-4/7*x = 0 // - 4/21
-4/7*x = -4/21 // : -4/7
x = -4/21/(-4/7)
x = 1/3
x = 1/3
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