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(3/5)*x-((1/10)*x) = x-(5/4) // - x-(5/4)
(3/5)*x-((1/10)*x)-x+5/4 = 0
(3/5)*x+(-1/10)*x-x+5/4 = 0
5/4-1/2*x = 0 // - 5/4
-1/2*x = -5/4 // : -1/2
x = -5/4/(-1/2)
x = 5/2
x = 5/2
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