1/2(15+7d)=-d/7

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Solution for 1/2(15+7d)=-d/7 equation: 


d in (-oo:+oo)

(1/2)*(7*d+15) = -d/7 // + -d/7

(1/2)*(7*d+15)-(-d/7) = 0

(1/2)*(7*d+15)+(1/7)*d = 0

1/2*(7*d+15)+d/7 = 0

(1/2*7*(7*d+15))/7+d/7 = 0

1/2*7*(7*d+15)+d = 0

51/2*d+105/2 = 0

(51/2*d+105/2)/7 = 0

(51/2*d+105/2)/7 = 0 // * 7

51/2*d+105/2 = 0

51/2*d+105/2 = 0 // - 105/2

51/2*d = -105/2 // : 51/2

d = -105/2/51/2

d = -35/17

d = -35/17

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