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x in (-oo:+oo)
-26 = 7*x-(3*x)+6 // - 7*x-(3*x)+6
3*x-(7*x)-26-6 = 0
3*x-7*x-26-6 = 0
-4*x-32 = 0 // + 32
-4*x = 32 // : -4
x = 32/(-4)
x = -8
x = -8
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