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(1/5)*(8*y-3)+(1/20)*(8*x+21) = 0
1/5*(8*y-3)+1/20*(8*x+21) = 0
1/5*(8*y-3)+1/20*(8*x+21) = 0
2/5*x+8/5*y+9/20 = 0
2/5*x+8/5*y+9/20 = 0
2/5*x+8/5*y+9/20 = 0 // - 8/5*y+9/20
2/5*x = -(8/5*y+9/20) // : 2/5
x = (-(8/5*y+9/20))/2/5
x = -5/2*(8/5*y+9/20)
x = -5/2*(8/5*y+9/20)
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