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x in (-oo:+oo)
15/7-(7*x) = 9 // - 9
15/7-(7*x)-9 = 0
15/7-7*x-9 = 0
-7*x-48/7 = 0 // + 48/7
-7*x = 48/7 // : -7
x = 48/7/(-7)
x = -48/49
x = -48/49
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