11-7=7d+21

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Solution for 11-7=7d+21 equation:


Simplifying
11 + -7 = 7d + 21

Combine like terms: 11 + -7 = 4
4 = 7d + 21

Reorder the terms:
4 = 21 + 7d

Solving
4 = 21 + 7d

Solving for variable 'd'.

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

Add '-7d' to each side of the equation.
4 + -7d = 21 + 7d + -7d

Combine like terms: 7d + -7d = 0
4 + -7d = 21 + 0
4 + -7d = 21

Add '-4' to each side of the equation.
4 + -4 + -7d = 21 + -4

Combine like terms: 4 + -4 = 0
0 + -7d = 21 + -4
-7d = 21 + -4

Combine like terms: 21 + -4 = 17
-7d = 17

Divide each side by '-7'.
d = -2.428571429

Simplifying
d = -2.428571429

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