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y in (-oo:+oo)
6*18-((2*y)/6) = 2*15 // - 2*15
6*18-((2*y)/6)-(2*15) = 0
(-1/3)*y+6*18-30 = 0
78-1/3*y = 0 // - 78
-1/3*y = -78 // : -1/3
y = -78/(-1/3)
y = 234
y = 234
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