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x in (-oo:+oo)
1-3*x = 4*x-13 // - 4*x-13
1-3*x-(4*x)+13 = 0
1-3*x-4*x+13 = 0
14-7*x = 0 // - 14
-7*x = -14 // : -7
x = -14/(-7)
x = 2
x = 2
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