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(-1/4)*x+4 = 5*x-1/5 // - 5*x-1/5
(-1/4)*x-(5*x)-(-1/5)+4 = 0
(-1/4)*x-5*x+1/5+4 = 0
21/5-21/4*x = 0 // - 21/5
-21/4*x = -21/5 // : -21/4
x = -21/5/(-21/4)
x = 4/5
x = 4/5
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