Solve for d
d=49
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3d=7\times 21
Variable d cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 7d, the least common multiple of 7,d.
3d=147
Multiply 7 and 21 to get 147.
d=\frac{147}{3}
Divide both sides by 3.
d=49
Divide 147 by 3 to get 49.
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