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03-09-2019
Mathematics

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What is this 15=2+4-d

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Аноним Аноним

03-09-2019

15=2+4-d

15=6+d

move 6 to the other side

sign changes from +6 to -6

15-6=6-6-d

15-6=-d

9=-d

Multiply both sides by -1 to get +d.

(9)(-1)=(-d)(-1)

Answer: d=-9

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