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x in (-oo:+oo)
2-2*x = 5*x-40 // - 5*x-40
2-2*x-(5*x)+40 = 0
2-2*x-5*x+40 = 0
42-7*x = 0 // - 42
-7*x = -42 // : -7
x = -42/(-7)
x = 6
x = 6
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