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x in (-oo:+oo)
3*x-(7*x)-2 = 26 // - 26
3*x-(7*x)-26-2 = 0
3*x-7*x-26-2 = 0
-4*x-28 = 0 // + 28
-4*x = 28 // : -4
x = 28/(-4)
x = -7
x = -7
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