7d+1+5d=121

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Solution for 7d+1+5d=121 equation: 


d in (-oo:+oo)

7*d+5*d+1 = 121 // - 121

7*d+5*d-121+1 = 0

12*d-120 = 0 // + 120

12*d = 120 // : 12

d = 120/12

d = 10

d = 10

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