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19+15d=(-20)+18d
We move all terms to the left:
19+15d-((-20)+18d)=0
We calculate terms in parentheses: -((-20)+18d), so:We get rid of parentheses
(-20)+18d
determiningTheFunctionDomain 18d+(-20)
We add all the numbers together, and all the variables
18d-20
Back to the equation:
-(18d-20)
15d-18d+20+19=0
We add all the numbers together, and all the variables
-3d+39=0
We move all terms containing d to the left, all other terms to the right
-3d=-39
d=-39/-3
d=+13
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