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x in (-oo:+oo)
2*(x+5) = 28 // - 28
2*(x+5)-28 = 0
2*(x+5)-28 = 0
2*x-18 = 0
2*x-18 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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