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x in (-oo:+oo)
2-(7*x) = -4*x-13 // + -4*x-13
2-(7*x)-(-4*x)+13 = 0
4*x-7*x+2+13 = 0
15-3*x = 0 // - 15
-3*x = -15 // : -3
x = -15/(-3)
x = 5
x = 5
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