7+2d-3d=15

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Solution for 7+2d-3d=15 equation: 


d in (-oo:+oo)

2*d-(3*d)+7 = 15 // - 15

2*d-(3*d)-15+7 = 0

2*d-3*d-15+7 = 0

-d-8 = 0 // + 8

-d = 8 // * -1

d = -8

d = -8

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