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2*x-4 = 3*(4/60) // - 3*(4/60)
2*x-(3*(4/60))-4 = 0
2*x-1/5-4 = 0
2*x-21/5 = 0 // + 21/5
2*x = 21/5 // : 2
x = 21/5/2
x = 21/10
x = 21/10
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