(80-X)+(90-2X)=360

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Solution for (80-X)+(90-2X)=360 equation: 


Simplifying
(80 + -1X) + (90 + -2X) = 360

Remove parenthesis around (80 + -1X)
80 + -1X + (90 + -2X) = 360

Remove parenthesis around (90 + -2X)
80 + -1X + 90 + -2X = 360

Reorder the terms:
80 + 90 + -1X + -2X = 360

Combine like terms: 80 + 90 = 170
170 + -1X + -2X = 360

Combine like terms: -1X + -2X = -3X
170 + -3X = 360

Solving
170 + -3X = 360

Solving for variable 'X'.

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

Add '-170' to each side of the equation.
170 + -170 + -3X = 360 + -170

Combine like terms: 170 + -170 = 0
0 + -3X = 360 + -170
-3X = 360 + -170

Combine like terms: 360 + -170 = 190
-3X = 190

Divide each side by '-3'.
X = -63.33333333

Simplifying
X = -63.33333333

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