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x in (-oo:+oo)
(1/3)*x+(1/5)*x = x-1120 // - x-1120
(1/3)*x+(1/5)*x-x+1120 = 0
1120-7/15*x = 0 // - 1120
-7/15*x = -1120 // : -7/15
x = -1120/(-7/15)
x = 2400
x = 2400
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