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y in (-oo:+oo)
(2*(y+12))/10 = 7 // - 7
(2*(y+12))/10-7 = 0
(2*(y+12))/10+(-7*10)/10 = 0
2*(y+12)-7*10 = 0
2*y-46 = 0
(2*y-46)/10 = 0
(2*y-46)/10 = 0 // * 10
2*y-46 = 0
2*y-46 = 0 // + 46
2*y = 46 // : 2
y = 46/2
y = 23
y = 23
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