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2.25/5 = x/4 // - x/4
2.25/5-(x/4) = 0
0.45-1/4*x = 0 // - 0.45
-1/4*x = -0.45 // : -1/4
x = -0.45/(-1/4)
x = 1.8
x = 1.8
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