12=-x+280

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Solution for 12=-x+280 equation:


Simplifying
12 = -1x + 280

Reorder the terms:
12 = 280 + -1x

Solving
12 = 280 + -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.
12 + x = 280 + -1x + x

Combine like terms: -1x + x = 0
12 + x = 280 + 0
12 + x = 280

Add '-12' to each side of the equation.
12 + -12 + x = 280 + -12

Combine like terms: 12 + -12 = 0
0 + x = 280 + -12
x = 280 + -12

Combine like terms: 280 + -12 = 268
x = 268

Simplifying
x = 268

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