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15*x-(20*((5/10)*x+1/10)) = -1 // + 1
15*x-(20*((5/10)*x+1/10))+1 = 0
15*x-20*((5/10)*x+1/10)+1 = 0
15*x-20*(1/2*x+1/10)+1 = 0
15*x-20*(1/2*x+1/10)+1 = 0
5*x-2+1 = 0
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x = 1/5
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