The expression for the turbo jet pack is 6d+7, the equation for the x-ray vision glasses is 2d-5, and the equation for the invisible shield is 10d+1.
The steps to write an expression are:
The expression is 6d (six times the boxes) + 7 (plus seven).
The expression is 2d - 5 (two times the number of boxes minus five.
The expression is 10d + 1 (ten times the number of boxes plus one).
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