7=-d+13

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Solution for 7=-d+13 equation:


Simplifying
7 = -1d + 13

Reorder the terms:
7 = 13 + -1d

Solving
7 = 13 + -1d

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add 'd' to each side of the equation.
7 + d = 13 + -1d + d

Combine like terms: -1d + d = 0
7 + d = 13 + 0
7 + d = 13

Add '-7' to each side of the equation.
7 + -7 + d = 13 + -7

Combine like terms: 7 + -7 = 0
0 + d = 13 + -7
d = 13 + -7

Combine like terms: 13 + -7 = 6
d = 6

Simplifying
d = 6

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