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x in (-oo:+oo)
x/3+5/3 = 10 // - 10
x/3+5/3-10 = 0
1/3*x-25/3 = 0 // + 25/3
1/3*x = 25/3 // : 1/3
x = 25/3/1/3
x = 25
x = 25
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