90=(2x+20)+(x+10)

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Solution for 90=(2x+20)+(x+10) equation: 


Simplifying
90 = (2x + 20) + (x + 10)

Reorder the terms:
90 = (20 + 2x) + (x + 10)

Remove parenthesis around (20 + 2x)
90 = 20 + 2x + (x + 10)

Reorder the terms:
90 = 20 + 2x + (10 + x)

Remove parenthesis around (10 + x)
90 = 20 + 2x + 10 + x

Reorder the terms:
90 = 20 + 10 + 2x + x

Combine like terms: 20 + 10 = 30
90 = 30 + 2x + x

Combine like terms: 2x + x = 3x
90 = 30 + 3x

Solving
90 = 30 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
90 + -3x = 30 + 3x + -3x

Combine like terms: 3x + -3x = 0
90 + -3x = 30 + 0
90 + -3x = 30

Add '-90' to each side of the equation.
90 + -90 + -3x = 30 + -90

Combine like terms: 90 + -90 = 0
0 + -3x = 30 + -90
-3x = 30 + -90

Combine like terms: 30 + -90 = -60
-3x = -60

Divide each side by '-3'.
x = 20

Simplifying
x = 20

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