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