90=(10x+21)+13x

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Solution for 90=(10x+21)+13x equation:


Simplifying
90 = (10x + 21) + 13x

Reorder the terms:
90 = (21 + 10x) + 13x

Remove parenthesis around (21 + 10x)
90 = 21 + 10x + 13x

Combine like terms: 10x + 13x = 23x
90 = 21 + 23x

Solving
90 = 21 + 23x

Solving for variable 'x'.

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

Add '-23x' to each side of the equation.
90 + -23x = 21 + 23x + -23x

Combine like terms: 23x + -23x = 0
90 + -23x = 21 + 0
90 + -23x = 21

Add '-90' to each side of the equation.
90 + -90 + -23x = 21 + -90

Combine like terms: 90 + -90 = 0
0 + -23x = 21 + -90
-23x = 21 + -90

Combine like terms: 21 + -90 = -69
-23x = -69

Divide each side by '-23'.
x = 3

Simplifying
x = 3

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