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x in (-oo:+oo)
15*x-(20*((10/15)*x-1/15)) = 1 // - 1
15*x-(20*((10/15)*x-1/15))-1 = 0
15*x-20*((10/15)*x-1/15)-1 = 0
15*x-20*(2/3*x-1/15)-1 = 0
15*x-20*(2/3*x-1/15)-1 = 0
5/3*x-1+4/3 = 0
5/3*x+1/3 = 0
5/3*x+1/3 = 0
5/3*x+1/3 = 0 // - 1/3
5/3*x = -1/3 // : 5/3
x = -1/3/5/3
x = -1/5
x = -1/5
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