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3*((7/2)*y+5/2) = 7*y+5 // - 7*y+5
3*((7/2)*y+5/2)-(7*y)-5 = 0
3*((7/2)*y+5/2)-7*y-5 = 0
3*(7/2*y+5/2)-7*y-5 = 0
3*(7/2*y+5/2)-7*y-5 = 0
7/2*y-5+15/2 = 0
7/2*y+5/2 = 0
7/2*y+5/2 = 0
7/2*y+5/2 = 0 // - 5/2
7/2*y = -5/2 // : 7/2
y = -5/2/7/2
y = -5/7
y = -5/7
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