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x in (-oo:+oo)
(13*x)/3 = 1521 // - 1521
(13*x)/3-1521 = 0
13/3*x-1521 = 0 // + 1521
13/3*x = 1521 // : 13/3
x = 1521/13/3
x = 351
x = 351
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