80=78+77+x

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Solution for 80=78+77+x equation:


Simplifying
80 = 78 + 77 + x

Combine like terms: 78 + 77 = 155
80 = 155 + x

Solving
80 = 155 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
80 + -1x = 155 + x + -1x

Combine like terms: x + -1x = 0
80 + -1x = 155 + 0
80 + -1x = 155

Add '-80' to each side of the equation.
80 + -80 + -1x = 155 + -80

Combine like terms: 80 + -80 = 0
0 + -1x = 155 + -80
-1x = 155 + -80

Combine like terms: 155 + -80 = 75
-1x = 75

Divide each side by '-1'.
x = -75

Simplifying
x = -75

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