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x in (-oo:+oo)
x+9 = 4*x+48/7 // - 4*x+48/7
x-(4*x)-(48/7)+9 = 0
x-4*x-48/7+9 = 0
15/7-3*x = 0 // - 15/7
-3*x = -15/7 // : -3
x = -15/7/(-3)
x = 5/7
x = 5/7
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