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2*x = (5*x-(2*y))/4 // - (5*x-(2*y))/4
2*x-((5*x-(2*y))/4) = 0
2*x-((5*x-2*y)/4) = 0
(-1*(5*x-2*y))/4+2*x = 0
(-1*(5*x-2*y))/4+(2*4*x)/4 = 0
2*4*x-1*(5*x-2*y) = 0
3*x+2*y = 0
(3*x+2*y)/4 = 0
(3*x+2*y)/4 = 0 // * 4
3*x+2*y = 0
3*x+2*y = 0 // - 2*y
3*x = -(2*y) // : 3
x = (-(2*y))/3
x = (-2*y)/3
x = (-2*y)/3
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