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x in (-oo:+oo)
-28 = (4/7)*x // - (4/7)*x
-((4/7)*x)-28 = 0
(-4/7)*x-28 = 0
-4/7*x-28 = 0 // + 28
-4/7*x = 28 // : -4/7
x = 28/(-4/7)
x = -49
x = -49
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