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x in (-oo:+oo)
-28 = (7*x)/9 // - (7*x)/9
-((7*x)/9)-28 = 0
(-7/9)*x-28 = 0
-7/9*x-28 = 0 // + 28
-7/9*x = 28 // : -7/9
x = 28/(-7/9)
x = -36
x = -36
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