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(1/5)*(7*y-2)+(1/20)*(12*y+21) = 0
1/5*(7*y-2)+1/20*(12*y+21) = 0
1/5*(7*y-2)+1/20*(12*y+21) = 0
2*y+13/20 = 0
2*y+13/20 = 0
2*y+13/20 = 0 // - 13/20
2*y = -13/20 // : 2
y = -13/20/2
y = -13/40
y = -13/40
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