400-0.2q=100

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Solution for 400-0.2q=100 equation: 


Simplifying
400 + -0.2q = 100

Solving
400 + -0.2q = 100

Solving for variable 'q'.

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

Add '-400' to each side of the equation.
400 + -400 + -0.2q = 100 + -400

Combine like terms: 400 + -400 = 0
0 + -0.2q = 100 + -400
-0.2q = 100 + -400

Combine like terms: 100 + -400 = -300
-0.2q = -300

Divide each side by '-0.2'.
q = 1500

Simplifying
q = 1500

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