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x in (-oo:+oo)
7 = (4/7)*x // - (4/7)*x
7-((4/7)*x) = 0
(-4/7)*x+7 = 0
7-4/7*x = 0 // - 7
-4/7*x = -7 // : -4/7
x = -7/(-4/7)
x = 49/4
x = 49/4
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