3x+80-x=45

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Solution for 3x+80-x=45 equation:


Simplifying
3x + 80 + -1x = 45

Reorder the terms:
80 + 3x + -1x = 45

Combine like terms: 3x + -1x = 2x
80 + 2x = 45

Solving
80 + 2x = 45

Solving for variable 'x'.

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

Add '-80' to each side of the equation.
80 + -80 + 2x = 45 + -80

Combine like terms: 80 + -80 = 0
0 + 2x = 45 + -80
2x = 45 + -80

Combine like terms: 45 + -80 = -35
2x = -35

Divide each side by '2'.
x = -17.5

Simplifying
x = -17.5

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