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(3*x+5)/2 = 15 // - 15
(3*x+5)/2-15 = 0
(3*x+5)/2+(-15*2)/2 = 0
3*x-15*2+5 = 0
3*x-25 = 0
(3*x-25)/2 = 0
(3*x-25)/2 = 0 // * 2
3*x-25 = 0
3*x-25 = 0 // + 25
3*x = 25 // : 3
x = 25/3
x = 25/3
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