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x in (-oo:+oo)
(2/3)*x-3 = 10 // - 10
(2/3)*x-10-3 = 0
2/3*x-13 = 0 // + 13
2/3*x = 13 // : 2/3
x = 13/2/3
x = 39/2
x = 39/2
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