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x in (-oo:+oo)
-4*x-9 = 7-6*x // - 7-6*x
-4*x-(-6*x)-9-7 = 0
6*x-4*x-9-7 = 0
2*x-16 = 0 // + 16
2*x = 16 // : 2
x = 16/2
x = 8
x = 8
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