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x in (-oo:+oo)
4*x+3 = 5*x+13 // - 5*x+13
4*x-(5*x)-13+3 = 0
4*x-5*x-13+3 = 0
-x-10 = 0 // + 10
-x = 10 // * -1
x = -10
x = -10
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