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x in (-oo:+oo)
2*x-(5*(2*x-(2/5))) = 18 // - 18
2*x-(5*(2*x-(2/5)))-18 = 0
2*x-5*(2*x-2/5)-18 = 0
2*x-5*(2*x-2/5)-18 = 0
2-8*x-18 = 0
-8*x-16 = 0
-8*x-16 = 0
-8*x-16 = 0 // + 16
-8*x = 16 // : -8
x = 16/(-8)
x = -2
x = -2
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