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x in (-oo:+oo)
16 = (4/7)*x // - (4/7)*x
16-((4/7)*x) = 0
(-4/7)*x+16 = 0
16-4/7*x = 0 // - 16
-4/7*x = -16 // : -4/7
x = -16/(-4/7)
x = 28
x = 28
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