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x in (-oo:+oo)
4*x+10 = 5*x+21 // - 5*x+21
4*x-(5*x)-21+10 = 0
4*x-5*x-21+10 = 0
-x-11 = 0 // + 11
-x = 11 // * -1
x = -11
x = -11
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