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x in (-oo:+oo)
30 = 7*x-5*x+6 // - 7*x-5*x+6
30-(-5*x)-(7*x)-6 = 0
5*x-7*x-6+30 = 0
24-2*x = 0 // - 24
-2*x = -24 // : -2
x = -24/(-2)
x = 12
x = 12
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