7d-100-3d=200

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Solution for 7d-100-3d=200 equation:


Simplifying
7d + -100 + -3d = 200

Reorder the terms:
-100 + 7d + -3d = 200

Combine like terms: 7d + -3d = 4d
-100 + 4d = 200

Solving
-100 + 4d = 200

Solving for variable 'd'.

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

Add '100' to each side of the equation.
-100 + 100 + 4d = 200 + 100

Combine like terms: -100 + 100 = 0
0 + 4d = 200 + 100
4d = 200 + 100

Combine like terms: 200 + 100 = 300
4d = 300

Divide each side by '4'.
d = 75

Simplifying
d = 75

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