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1.8*x = 400/5 // - 400/5
1.8*x-(400/5) = 0
1.8*x-80 = 0
1.8*x-80 = 0 // + 80
1.8*x = 80 // : 1.8
x = 80/1.8
x = 44.44444444
x = 44.44444444
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