X+Y+X+Y+80+90=100

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Solution for X+Y+X+Y+80+90=100 equation: 


Simplifying
X + Y + X + Y + 80 + 90 = 100

Reorder the terms:
80 + 90 + X + X + Y + Y = 100

Combine like terms: 80 + 90 = 170
170 + X + X + Y + Y = 100

Combine like terms: X + X = 2X
170 + 2X + Y + Y = 100

Combine like terms: Y + Y = 2Y
170 + 2X + 2Y = 100

Solving
170 + 2X + 2Y = 100

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 + 2X + -170 + 2Y = 100 + -170

Reorder the terms:
170 + -170 + 2X + 2Y = 100 + -170

Combine like terms: 170 + -170 = 0
0 + 2X + 2Y = 100 + -170
2X + 2Y = 100 + -170

Combine like terms: 100 + -170 = -70
2X + 2Y = -70

Add '-2Y' to each side of the equation.
2X + 2Y + -2Y = -70 + -2Y

Combine like terms: 2Y + -2Y = 0
2X + 0 = -70 + -2Y
2X = -70 + -2Y

Divide each side by '2'.
X = -35 + -1Y

Simplifying
X = -35 + -1Y

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