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25-((4/10)*x) = 2.9 // - 2.9
25-((4/10)*x)-2.9 = 0
(-2/5)*x-2.9+25 = 0
22.1-2/5*x = 0 // - 22.1
-2/5*x = -22.1 // : -2/5
x = -22.1/(-2/5)
x = 55.25
x = 55.25
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