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x in (-oo:+oo)
(-13/7)*x = -3 // + 3
(-13/7)*x+3 = 0
3-13/7*x = 0 // - 3
-13/7*x = -3 // : -13/7
x = -3/(-13/7)
x = 21/13
x = 21/13
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