I'm not completely positive but I believe this is how you do it.

<span><u>7d=4d+21</u></span>

<span><u />7d - 4d = 21</span>

<span>3d = 21 </span>

<span>3d / 3 = 21 / 3</span>

<span>d = 7</span>

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The answer is 7794, rounded is 7790.

Since the 4 in the ones place is not greater than 5, you round down and get 0.

Answer i am not sure wht it is srry

Step-by-step explanation: