7=-d+15

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Solution for 7=-d+15 equation:


Simplifying
7 = -1d + 15

Reorder the terms:
7 = 15 + -1d

Solving
7 = 15 + -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 = 15 + -1d + d

Combine like terms: -1d + d = 0
7 + d = 15 + 0
7 + d = 15

Add '-7' to each side of the equation.
7 + -7 + d = 15 + -7

Combine like terms: 7 + -7 = 0
0 + d = 15 + -7
d = 15 + -7

Combine like terms: 15 + -7 = 8
d = 8

Simplifying
d = 8

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