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-10(4+d)+7d=-49
We move all terms to the left:
-10(4+d)+7d-(-49)=0
We add all the numbers together, and all the variables
-10(d+4)+7d-(-49)=0
We add all the numbers together, and all the variables
7d-10(d+4)+49=0
We multiply parentheses
7d-10d-40+49=0
We add all the numbers together, and all the variables
-3d+9=0
We move all terms containing d to the left, all other terms to the right
-3d=-9
d=-9/-3
d=+3
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