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x in (-oo:+oo)
5*x+8 = 2*x+26 // - 2*x+26
5*x-(2*x)-26+8 = 0
5*x-2*x-26+8 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x = 6
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