x(x+40)=(x+10)(x+20)

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Solution for x(x+40)=(x+10)(x+20) equation:


Simplifying
x(x + 40) = (x + 10)(x + 20)

Reorder the terms:
x(40 + x) = (x + 10)(x + 20)
(40 * x + x * x) = (x + 10)(x + 20)
(40x + x2) = (x + 10)(x + 20)

Reorder the terms:
40x + x2 = (10 + x)(x + 20)

Reorder the terms:
40x + x2 = (10 + x)(20 + x)

Multiply (10 + x) * (20 + x)
40x + x2 = (10(20 + x) + x(20 + x))
40x + x2 = ((20 * 10 + x * 10) + x(20 + x))
40x + x2 = ((200 + 10x) + x(20 + x))
40x + x2 = (200 + 10x + (20 * x + x * x))
40x + x2 = (200 + 10x + (20x + x2))

Combine like terms: 10x + 20x = 30x
40x + x2 = (200 + 30x + x2)

Add '-1x2' to each side of the equation.
40x + x2 + -1x2 = 200 + 30x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
40x + 0 = 200 + 30x + x2 + -1x2
40x = 200 + 30x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
40x = 200 + 30x + 0
40x = 200 + 30x

Solving
40x = 200 + 30x

Solving for variable 'x'.

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

Add '-30x' to each side of the equation.
40x + -30x = 200 + 30x + -30x

Combine like terms: 40x + -30x = 10x
10x = 200 + 30x + -30x

Combine like terms: 30x + -30x = 0
10x = 200 + 0
10x = 200

Divide each side by '10'.
x = 20

Simplifying
x = 20

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