900=10x+5(100-x)

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Solution for 900=10x+5(100-x) equation:


Simplifying
900 = 10x + 5(100 + -1x)
900 = 10x + (100 * 5 + -1x * 5)
900 = 10x + (500 + -5x)

Reorder the terms:
900 = 500 + 10x + -5x

Combine like terms: 10x + -5x = 5x
900 = 500 + 5x

Solving
900 = 500 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
900 + -5x = 500 + 5x + -5x

Combine like terms: 5x + -5x = 0
900 + -5x = 500 + 0
900 + -5x = 500

Add '-900' to each side of the equation.
900 + -900 + -5x = 500 + -900

Combine like terms: 900 + -900 = 0
0 + -5x = 500 + -900
-5x = 500 + -900

Combine like terms: 500 + -900 = -400
-5x = -400

Divide each side by '-5'.
x = 80

Simplifying
x = 80

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