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11.70 + 2*3.90 + d = 21.08 + 2.00

how do I find out d?

2 answers

Combine like terms.

11.70 + 2*3.90 + d = 21.08 + 2.00

11.70 + 7.8 + d = 23.08

19.5 + d = 23.08

Subtract 19.5 from both sides.

d = 3.58

11.70 + 7.80 + d = 23.08

d = 23.08 - 7.80 - 11.70

d = 3.58

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