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3.5/5 = x/4 // - x/4
3.5/5-(x/4) = 0
0.7-1/4*x = 0 // - 0.7
-1/4*x = -0.7 // : -1/4
x = -0.7/(-1/4)
x = 2.8
x = 2.8
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