300-40d=140

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Solution for 300-40d=140 equation: 


Simplifying
300 + -40d = 140

Solving
300 + -40d = 140

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 + -40d = 140 + -300

Combine like terms: 300 + -300 = 0
0 + -40d = 140 + -300
-40d = 140 + -300

Combine like terms: 140 + -300 = -160
-40d = -160

Divide each side by '-40'.
d = 4

Simplifying
d = 4

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