Answer:
1,1/7 or 0.85
Explanation:
d-10-2d+7=8+d-10-3d=-5d=-d=d=5
in mathematics there is nothing like 1d,it is d
re-arrange
d-2d-d+3d+5d+d-d=10-7+8-10+5
7d=6
d=6/7
d=1,1/7 or 0.85
D=1
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