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25-((4/10)*x) = 45 // - 45
25-((4/10)*x)-45 = 0
(-2/5)*x-45+25 = 0
-2/5*x-20 = 0 // + 20
-2/5*x = 20 // : -2/5
x = 20/(-2/5)
x = -50
x = -50
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