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7.2/3.5 = x/4.25 // - x/4.25
7.2/3.5-(x/4.25) = 0
7.2/3.5-0.23529412*x = 0
2.05714286-0.23529412*x = 0 // - 2.05714286
-0.23529412*x = -2.05714286 // : -0.23529412
x = -2.05714286/(-0.23529412)
x = 8.74285707
x = 8.74285707
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