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b) 4

:( you shouldn't give the answer. she is perfectly capable of learning how to solve this equation.

dont even -_-

yes?

Just sum the equals and then pass the number for the another side of the equation.

\[4d+2d-4d+4=3d \]
\[2d+4=3d\]
\[2d(-2d)+4=3d(-2d)\]
\[4=d \]