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x in (-oo:+oo)
-x/4 = -4/7 // + -4/7
-x/4-(-4/7) = 0
4/7-x/4 = 0
4/7-1/4*x = 0 // - 4/7
-1/4*x = -4/7 // : -1/4
x = -4/7/(-1/4)
x = 16/7
x = 16/7
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