D/3+10=7
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D = -9

Step-by-step explanation:

Solve for D:

D/3 + 10 = 7

Hint: | Put the fractions in D/3 + 10 over a common denominator.

Put each term in D/3 + 10 over the common denominator 3: D/3 + 10 = D/3 + 30/3:

D/3 + 30/3 = 7

Hint: | Combine D/3 + 30/3 into a single fraction.

D/3 + 30/3 = (D + 30)/3:

(D + 30)/3 = 7

Hint: | Multiply both sides by a constant to simplify the equation.

Multiply both sides of (D + 30)/3 = 7 by 3:

(3 (D + 30))/3 = 3×7

Hint: | Cancel common terms in the numerator and denominator of (3 (D + 30))/3.

(3 (D + 30))/3 = 3/3×(D + 30) = D + 30:

D + 30 = 3×7

Hint: | Multiply 3 and 7 together.

3×7 = 21:

D + 30 = 21

Hint: | Isolate terms with D to the left hand side.

Subtract 30 from both sides:

D + (30 - 30) = 21 - 30

Hint: | Look for the difference of two identical terms.

30 - 30 = 0:

D = 21 - 30

Hint: | Evaluate 21 - 30.

21 - 30 = -9:

 D = -9

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