4d+3d+7=21

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Solution for 4d+3d+7=21 equation: 


Simplifying
4d + 3d + 7 = 21

Reorder the terms:
7 + 4d + 3d = 21

Combine like terms: 4d + 3d = 7d
7 + 7d = 21

Solving
7 + 7d = 21

Solving for variable 'd'.

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

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

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

Combine like terms: 21 + -7 = 14
7d = 14

Divide each side by '7'.
d = 2

Simplifying
d = 2

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