100=28-9x

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Solution for 100=28-9x equation:


Simplifying
100 = 28 + -9x

Solving
100 = 28 + -9x

Solving for variable 'x'.

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

Add '9x' to each side of the equation.
100 + 9x = 28 + -9x + 9x

Combine like terms: -9x + 9x = 0
100 + 9x = 28 + 0
100 + 9x = 28

Add '-100' to each side of the equation.
100 + -100 + 9x = 28 + -100

Combine like terms: 100 + -100 = 0
0 + 9x = 28 + -100
9x = 28 + -100

Combine like terms: 28 + -100 = -72
9x = -72

Divide each side by '9'.
x = -8

Simplifying
x = -8

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