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y in (-oo:+oo)
(1/2)*(6*y-10) = 7 // - 7
(1/2)*(6*y-10)-7 = 0
1/2*(6*y-10)-7 = 0
1/2*(6*y-10)-7 = 0
3*y-12 = 0
3*y-12 = 0
3*y-12 = 0 // + 12
3*y = 12 // : 3
y = 12/3
y = 4
y = 4
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