84=90-x

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Solution for 84=90-x equation:


Simplifying
84 = 90 + -1x

Solving
84 = 90 + -1x

Solving for variable 'x'.

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

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

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

Add '-84' to each side of the equation.
84 + -84 + x = 90 + -84

Combine like terms: 84 + -84 = 0
0 + x = 90 + -84
x = 90 + -84

Combine like terms: 90 + -84 = 6
x = 6

Simplifying
x = 6

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