900=20(10+20x)

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Solution for 900=20(10+20x) equation: 


Simplifying
900 = 20(10 + 20x)
900 = (10 * 20 + 20x * 20)
900 = (200 + 400x)

Solving
900 = 200 + 400x

Solving for variable 'x'.

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

Add '-400x' to each side of the equation.
900 + -400x = 200 + 400x + -400x

Combine like terms: 400x + -400x = 0
900 + -400x = 200 + 0
900 + -400x = 200

Add '-900' to each side of the equation.
900 + -900 + -400x = 200 + -900

Combine like terms: 900 + -900 = 0
0 + -400x = 200 + -900
-400x = 200 + -900

Combine like terms: 200 + -900 = -700
-400x = -700

Divide each side by '-400'.
x = 1.75

Simplifying
x = 1.75

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