4=-x+1+8

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Solution for 4=-x+1+8 equation:


Simplifying
4 = -1x + 1 + 8

Reorder the terms:
4 = 1 + 8 + -1x

Combine like terms: 1 + 8 = 9
4 = 9 + -1x

Solving
4 = 9 + -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.
4 + x = 9 + -1x + x

Combine like terms: -1x + x = 0
4 + x = 9 + 0
4 + x = 9

Add '-4' to each side of the equation.
4 + -4 + x = 9 + -4

Combine like terms: 4 + -4 = 0
0 + x = 9 + -4
x = 9 + -4

Combine like terms: 9 + -4 = 5
x = 5

Simplifying
x = 5

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