300-30d=120

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Solution for 300-30d=120 equation: 


Simplifying
300 + -30d = 120

Solving
300 + -30d = 120

Solving for variable 'd'.

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

Add '-300' to each side of the equation.
300 + -300 + -30d = 120 + -300

Combine like terms: 300 + -300 = 0
0 + -30d = 120 + -300
-30d = 120 + -300

Combine like terms: 120 + -300 = -180
-30d = -180

Divide each side by '-30'.
d = 6

Simplifying
d = 6

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