5x+5(x-20)=400

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Solution for 5x+5(x-20)=400 equation:


Simplifying
5x + 5(x + -20) = 400

Reorder the terms:
5x + 5(-20 + x) = 400
5x + (-20 * 5 + x * 5) = 400
5x + (-100 + 5x) = 400

Reorder the terms:
-100 + 5x + 5x = 400

Combine like terms: 5x + 5x = 10x
-100 + 10x = 400

Solving
-100 + 10x = 400

Solving for variable 'x'.

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

Add '100' to each side of the equation.
-100 + 100 + 10x = 400 + 100

Combine like terms: -100 + 100 = 0
0 + 10x = 400 + 100
10x = 400 + 100

Combine like terms: 400 + 100 = 500
10x = 500

Divide each side by '10'.
x = 50

Simplifying
x = 50

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