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(1/2)*(10*y+4)+5*y+2 = 0
1/2*(10*y+4)+5*y+2 = 0
1/2*(10*y+4)+5*y+2 = 0
10*y+2+2 = 0
10*y+4 = 0
10*y+4 = 0
10*y+4 = 0 // - 4
10*y = -4 // : 10
y = -4/10
y = -2/5
y = -2/5
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