10[9+x]=80

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Solution for 10[9+x]=80 equation: 


Simplifying
10[9 + x] = 80
[9 * 10 + x * 10] = 80
[90 + 10x] = 80

Solving
90 + 10x = 80

Solving for variable 'x'.

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

Add '-90' to each side of the equation.
90 + -90 + 10x = 80 + -90

Combine like terms: 90 + -90 = 0
0 + 10x = 80 + -90
10x = 80 + -90

Combine like terms: 80 + -90 = -10
10x = -10

Divide each side by '10'.
x = -1

Simplifying
x = -1

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