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x in (-oo:+oo)
10*(13/2) = 2*x+42 // - 2*x+42
10*(13/2)-(2*x)-42 = 0
10*(13/2)-2*x-42 = 0
23-2*x = 0 // - 23
-2*x = -23 // : -2
x = -23/(-2)
x = 23/2
x = 23/2
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