What is the value of x ? 4 fifths x minus 1 tenth is equal to 3 tenths

Add 1/10 to both sides: (4/5)x = 3/10 + 1/10 = 4/10 = 2/5. Divide both sides by 4/5, so x = (2/5) ÷ (4/5) = 1/2. The correct choice is C, 1 half.

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