x+90=(2x+21)

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Solution for x+90=(2x+21) equation:


Simplifying
x + 90 = (2x + 21)

Reorder the terms:
90 + x = (2x + 21)

Reorder the terms:
90 + x = (21 + 2x)

Remove parenthesis around (21 + 2x)
90 + x = 21 + 2x

Solving
90 + x = 21 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
90 + x + -2x = 21 + 2x + -2x

Combine like terms: x + -2x = -1x
90 + -1x = 21 + 2x + -2x

Combine like terms: 2x + -2x = 0
90 + -1x = 21 + 0
90 + -1x = 21

Add '-90' to each side of the equation.
90 + -90 + -1x = 21 + -90

Combine like terms: 90 + -90 = 0
0 + -1x = 21 + -90
-1x = 21 + -90

Combine like terms: 21 + -90 = -69
-1x = -69

Divide each side by '-1'.
x = 69

Simplifying
x = 69

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