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(4*x)/6 = 2.5 // - 2.5
(4*x)/6-2.5 = 0
2/3*x-2.5 = 0 // + 2.5
2/3*x = 2.5 // : 2/3
x = 2.5/2/3
x = 3.74999998
x = 3.74999998
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