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15(10-d)+22d=199
We move all terms to the left:
15(10-d)+22d-(199)=0
We add all the numbers together, and all the variables
15(-1d+10)+22d-199=0
We add all the numbers together, and all the variables
22d+15(-1d+10)-199=0
We multiply parentheses
22d-15d+150-199=0
We add all the numbers together, and all the variables
7d-49=0
We move all terms containing d to the left, all other terms to the right
7d=49
d=49/7
d=7
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