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