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x in (-oo:+oo)
(-4/7)*x+9 = 51/7 // - 51/7
(-4/7)*x-(51/7)+9 = 0
(-4/7)*x-51/7+9 = 0
12/7-4/7*x = 0 // - 12/7
-4/7*x = -12/7 // : -4/7
x = -12/7/(-4/7)
x = 3
x = 3
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