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1.8 = 30*(x/100) // - 30*(x/100)
1.8-(30*(x/100)) = 0
(-3/10)*x+1.8 = 0
1.8-3/10*x = 0 // - 1.8
-3/10*x = -1.8 // : -3/10
x = -1.8/(-3/10)
x = 6
x = 6
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