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(3*y-20)/3 = -5 // + 5
(3*y-20)/3+5 = 0
(3*y-20)/3+(3*5)/3 = 0
3*y+3*5-20 = 0
3*y-5 = 0
(3*y-5)/3 = 0
(3*y-5)/3 = 0 // * 3
3*y-5 = 0
3*y-5 = 0 // + 5
3*y = 5 // : 3
y = 5/3
y = 5/3
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