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x in (-oo:+oo)
x/5 = 2*x-45 // - 2*x-45
x/5-(2*x)+45 = 0
x/5-2*x+45 = 0
45-9/5*x = 0 // - 45
-9/5*x = -45 // : -9/5
x = -45/(-9/5)
x = 25
x = 25
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